题目内容
【题目】用递等式计算
(1)36+61.2-12 (2)(20-1.4×2)×0.4 (3)(3.94+6.86)×0.8-8
【答案】(1)85.2
(2)6.88
(3)0.64
【解析】
(1)36+61.2-12
=97.2-12
=85.2
(2)(20-1.4×2)×0.4
=(20-2.8)×0.4
=17.1×0.4
=6.88
(3)(3.94+6.86)×0.8-8
=10.8×0.8-8
=8.64-8
=0.64
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