递等式计算(能简便的用简便方法).2.8×7.6+1.4×2.8+2.870.8-0.8×0.513-
答案:1 悬赏:30 手机版
解决时间 2021-03-11 05:21
- 提问者网友:我们很暧昧
- 2021-03-10 05:12
递等式计算(能简便的用简便方法).2.8×7.6+1.4×2.8+2.870.8-0.8×0.513-
最佳答案
- 五星知识达人网友:轮獄道
- 2021-03-10 06:00
(1)2.8×7.6+1.4×2.8+2.8
=2.8×(7.6+1.4+1)
=2.8×10
=28;
(2)70.8-0.8×0.5
=70.8-0.4
=70.4;
(3)13-3.79-6.21
=13-(3.79+6.21)
=13-10
=3;
(4)5×(40+0.7)
=5×40+5×0.7
=200+3.5
=203.5;
(5)4.12-1.78-1.22
=4.12-(1.78+1.22)
=4.12-3
=1.12;
(6)4.2÷0.7÷6
=6÷6
=1.
=2.8×(7.6+1.4+1)
=2.8×10
=28;
(2)70.8-0.8×0.5
=70.8-0.4
=70.4;
(3)13-3.79-6.21
=13-(3.79+6.21)
=13-10
=3;
(4)5×(40+0.7)
=5×40+5×0.7
=200+3.5
=203.5;
(5)4.12-1.78-1.22
=4.12-(1.78+1.22)
=4.12-3
=1.12;
(6)4.2÷0.7÷6
=6÷6
=1.
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