题目内容
【题目】用简便方法计算。
7.3+4.6+2.7 80-12.4-7.6
4.6+0.8-4.6-0.8 27.26-(16.8-2.74)
【答案】14.6 60 0 13.2
【解析】
7.3+4.6+2.7
=7.3+2.7+4.6
=10+4.6
=14.6
80-12.4-7.6
=80-(12.4+7.6)
=80-20
=60
4.6+0.8-4.6-0.8
=(4.6-4.6)+(0.8-0.8)
=0+0
=0
27.26-(16.8-2.74)
=27.26-16.8+2.74
=27.26+2.74-16.8
=30-16.8
=13.2
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