四年级上册简便算法脱式计算
1.95.6*18+0.4*18
=(95.6+0.4)*18
=96*18
=1728
2.907*99+907
=907*(99+1)
=907*100
=90700
3.0.6*143-0.6*43
=0.6*(143-43)
=0.6*100
=60
4.6.5*8+3.5*8-47
=(6.5+3.5)*8-47
=80-47
=33
5.14*2.25+14*3.75
=(2.25+3.75)*14
=6*14
=84
6.3.5*0.8+5.5*0.8+0.8
=(3.5+5.5+1)*0.8
=10*0.8
=8
7.7.28-1.5*2.4+2.72
=(7.28+2.72)-1.5*2.4
=10-3.6
=6.4
=(95.6+0.4)*18
=96*18
=1728
2.907*99+907
=907*(99+1)
=907*100
=90700
3.0.6*143-0.6*43
=0.6*(143-43)
=0.6*100
=60
4.6.5*8+3.5*8-47
=(6.5+3.5)*8-47
=80-47
=33
5.14*2.25+14*3.75
=(2.25+3.75)*14
=6*14
=84
6.3.5*0.8+5.5*0.8+0.8
=(3.5+5.5+1)*0.8
=10*0.8
=8
7.7.28-1.5*2.4+2.72
=(7.28+2.72)-1.5*2.4
=10-3.6
=6.4
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