计算下面各题，怎样简便就怎样计算。 12.5+5.7-7.5 23.04-(8.5+7.25) 3
计算下面各题，怎样简便就怎样计算。12.5+5.7-7.523.04-(8.5+7.25)3.28+15.74+4.26+1.7250-18.6-11.416.72+8....
计算下面各题，怎样简便就怎样计算。
12.5+5.7-7.5
23.04-(8.5+7.25)
3.28+15.74+4.26+1.72
50-18.6-11.4
16.72+8.54+3.28
8.94+7.65-6.94 展开
12.5+5.7-7.5
23.04-(8.5+7.25)
3.28+15.74+4.26+1.72
50-18.6-11.4
16.72+8.54+3.28
8.94+7.65-6.94 展开
2个回答
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12.5+5.7-7.5
=(12.5-7.5)+5.7
=5+5.7
=10.7
23.04-(8.5+7.25)
=23.04-15.75
=7.29
3.28+15.74+4.26+1.72
=(3.28+1.72)+(15.74+4.26)
=5+20
=25
50-18.6-11.4
=50-(18.6+11.4)
=50-30
=20
16.72+8.54+3.28
=(16.72+3.28)+8.54
=20+8.54
=28.54
8.94+7.65-6.94
=(8.94-6.94)+7.65
=2+7.65
=9.65
=(12.5-7.5)+5.7
=5+5.7
=10.7
23.04-(8.5+7.25)
=23.04-15.75
=7.29
3.28+15.74+4.26+1.72
=(3.28+1.72)+(15.74+4.26)
=5+20
=25
50-18.6-11.4
=50-(18.6+11.4)
=50-30
=20
16.72+8.54+3.28
=(16.72+3.28)+8.54
=20+8.54
=28.54
8.94+7.65-6.94
=(8.94-6.94)+7.65
=2+7.65
=9.65
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