问题
计算题
用简便算法计算下列各题。
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答案
(1)原式=7.04+12.96+8.73
=20+8.73
=28.73
=10+20
=30
(3)原式= 4.308-3.308+4.298
=1+4.298
=5.298
=17-10
=7
(5)原式=9.93-5.93+7.29
= 4+7.29
=11.29
=8.47+0
=8.47
(7)原式=6.87+3.13+(2.8+7.2)
=10+10
=20
=7-1
=6