【文章內(nèi)容簡介】 04－20247。4 15247。3＋10247。5 25247。5＋42247。6= = == = =35247。5＋87 72247。9－36247。6 214－54247。9 = = == = = 72247。8＋95 36247。4＋212 25247。5－16247。4 = = == = =56247。7＋36247。6 500(400－396) 72247。9－5= = == = =564+264453 7650(546+4530) 659450= = == = =980+980 9000(4500+250) 6700+72247。8= = == = =146+95 900247。(7168) 180247。942247。6= = == = =12247。6＋453 8(910720) 760540+1110= = == = =6500+12503500 8030+5600 945032004200= = == = =2400247。6－45 800 7－180 1600247。2＋230 = = == = =4000 247。 8 + 350 320247。8＋64 270 247。 3 9= = == = =630 247。 9 + 320 2800+32 6 300247。69 = = == = =(69002400)247。 5 （72247。9）247。(56247。8) 54 247。 9 8= = == = =280 4 247。5 608+1570 60(2317) = = == = =960247。49 350247。59 450247。5+1250 = = == = =(69002400)247。5 75247。15＋205 3090＋66= = == = =(387－387)＋0 160－160247。80 750＋550247。5=