题目内容
【题目】下面各题,怎样简便就怎样算。
1.88+1.3+4.7 15.17-6.8-3.2
4.02-3.5+0.98 1.27+3.9+0.73+16.1
【答案】7.88;5.17;
1.5;22
【解析】
1.88+1.3+4.7
=1.88+(1.3+4.7 )
=1.88+6
=7.88
15.17-6.8-3.2
=15.17-(6.8+3.2)
=15.17-10
=5.17
4.02-3.5+0.98
=4.02+0.98-3.5
=5-3.5
=1.5
1.27+3.9+0.73+16.1
=(1.27+0.73)+(3.9+16.1)
=2+20
=22
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