【正文】
-( 6 4 2) =( 60+40+24) 2 2- 24 2 =124 2 2 - 48 =496- 48 =448( c㎡ ) ( 10 6+10 4+6 4) 2 2-( 10 4 2) =( 60+40+24) 2 2- 40 2 =124 2 2 - 80 =496- 80 =416( c㎡ ) 本課小結(jié) 同學(xué)們,今天你們有什么收獲? 謝謝觀看 /歡迎下載 BY FAITH I MEAN A VISION OF GOOD ONE CHERISHES AND THE ENTHUSIASM THAT PUSHES ONE TO SEEK ITS FULFILLMENT REGARDLESS OF OBSTACLES. BY FAITH I BY FAITH