简便运算(要过程):①1又5/8+2又1/6+1.375+4又5/6
=1又5/8+1又3/8+2又1/6+4又5/6
=3+7
=10
②10-10又8/11-8又311
=10-(10又8/11+8又311)
=10-19
=-9
③2又1/3+3又7/10+1又2/3
=2又1/3+1又2/3+3又7/10
=4+3又7/10
=7又7/10
④9.24-3又3/5-2又2/5
=9.24-(3又3/5+2又2/5)
=9.24-6
=3.24
⑤0.75+1/10-1/2
=3/4-2/4+1/10
=1/4+1/10
=7/20
⑥1又11/12+(2又1/3-1/4)
=1又11/12+2又4/12-3/12
=1又11/12+2又1/12
=4
解决问题(要过程)
①甲、乙两辆车共运货物10.5t,甲车运的货物比乙车运的2倍少1/2t,甲乙两车共运货物多少t?
②一块上底是29m,下底是52m,高是10m的体性第里种油菜,株距0.2m,行距0.27m.这块地里可种油菜多少株?
③工人们要为一个长50m、宽15m、深2m的游泳池上贴上瓷砖,要贴多少平方米?
50*15+2*15*2+2*50*2=750+60+200=1010平方米
计算(要过程)
3又1/4+(2.2+4又7/10)-(2又1/4-1又5/6)
=3又1/4+2又2/10+4又7/10-2又1/4+1又5/6
=3又1/4-2又1/4+6又9/10+1又5/6
=1+6又27/30+1又25/30
=9又11/15