怎样简便怎样算. 7.2×7.2+7.2×2.8 &nbs...
答案:1 悬赏:40 手机版
解决时间 2021-02-14 16:41
- 提问者网友:你挡着我发光了
- 2021-02-14 06:51
怎样简便怎样算. 7.2×7.2+7.2×2.8 &nbs...
最佳答案
- 五星知识达人网友:春色三分
- 2021-02-14 07:28
(1)7.2×7.2+7.2×2.8
=7.2×(7.2+2.8)
=7.2×10
=72
(2)4.87×0.8×125
=4.87×(0.8×125)
=4.87×100
=487
(3)0.86×99
=0.86×(100-1)
=0.86×100-0.86
=86-0.86
=85.14
(4)48÷[6×(4.4-4)]
=48÷[6×0.4]
=48÷2.4
=20
(5)0.25×32×12.5
=(0.25×4)×(8×12.5)
=1×100
=100
(6)5.7-0.45÷1.5×3
=5.7-0.3×3
=5.7-0.9
=4.8
=7.2×(7.2+2.8)
=7.2×10
=72
(2)4.87×0.8×125
=4.87×(0.8×125)
=4.87×100
=487
(3)0.86×99
=0.86×(100-1)
=0.86×100-0.86
=86-0.86
=85.14
(4)48÷[6×(4.4-4)]
=48÷[6×0.4]
=48÷2.4
=20
(5)0.25×32×12.5
=(0.25×4)×(8×12.5)
=1×100
=100
(6)5.7-0.45÷1.5×3
=5.7-0.3×3
=5.7-0.9
=4.8
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