【正文】 ....................................................................................14 (六 ) 運(yùn)算順序 .....................................................................................................................................16 第二章 度量衡 ................................................................................................................................................16 一、 長(zhǎng)度 ................................................................................................................................................16 (一 ) 什么是長(zhǎng)度 ....................................................................................................................................16 (二 ) 長(zhǎng)度常用單位 ................................................................................................................................16 (三 ) 單位之間的換算 ............................................................................................................................17 二、 面積 ................................................................................................................................................17 (一 ) 什么是面積 .................................................................................................................................17 (二 ) 常用的面積單位 ............................................................................................................................17 專注于中小學(xué)教育 聯(lián)系電話： 18991890913 3 (三 ) 面積單位的換算 ............................................................................................................................17 三、 體積和容積 ....................................................................................................................................17 (一 ) 什么是體積、容積 ........................................................................................................................17 (二 ) 常用單位 ........................................................................................................................................17 (三 ) 單位換算 ........................................................................................................................................17 四、 質(zhì)量 ................................................................................................................................................18 (一 ) 什么是質(zhì)量 ....................................................................................................................................18 (二 ) 常用單位 ........................................................................................................................................18 (三 ) 常用換算 ........................................................................................................................................18 五、 時(shí)間 ................................................................................................................................................18 (一 ) 什么是時(shí)間 ....................................................................................................................................18 (二 ) 常用單位 ........................................................................................................................................18 (三 ) 單位換算 ........................................................................................................................................18 六、 貨幣 ................................................................................................................................................19 (一 ) 什么是貨幣 ....................................................................................................................................19 (二 ) 常用單位 ........................................................................................................................................19 (三 ) 單位換算 ........................................................................................................................................19 第三章 代數(shù)初步知識(shí) ....................................................................................................................................19 一、 用字母表示數(shù) ................................................................................................................................19 (一 ) 用字母表示數(shù)的意義和作用 ........................................................................................................19 (二 ) 用字母表示常見的數(shù)量關(guān)系、運(yùn)算定律和性質(zhì)、幾何形體的計(jì)算公式 ................................19 (三 ) 用字母表示數(shù)的寫法 ....................................................................................................................21 (四 ) 將數(shù)值代入式子求值 ....................................................................................................................21 二、 簡(jiǎn)易方程 ........................................................................................................................................21 方程和方程的解 ......................................................................................................................................21 三、 解方程 ............................................................................................................................................22 四、 列方程解應(yīng)用題 ............................................................................................................................22 (一 ) 列方程解應(yīng)用題的意義 ................................................................................................................22 (二 ) 列方程解答應(yīng)用題的步驟 ............................................................................................................22 (三 ) 列方程解應(yīng)用題的方法 ................................................................................................................22 (四 ) 列方程解應(yīng)用題的范圍 ................................................................................................................22 五、 比和比例 .........