计算:(1)12.5×111-1.
答案:1 悬赏:30 手机版
解决时间 2021-03-11 16:18
- 提问者网友:缘字诀
- 2021-03-11 09:53
计算:(1)12.5×111-1.
最佳答案
- 五星知识达人网友:封刀令
- 2021-03-11 10:44
(1)12.5×111-1.5×25,
=12.5×111-3×12.5,
=(111-3)×12.5,
=(100+8)×12.5,
=100×12.5+8×12.5,
=1250+100,
=1350;
(2)49.2492492÷1.23123123,
=(49.2492492×4)÷(1.23123123×4),
=49.2492492÷(1.23123123×4)×4,
=49.2492492÷4.92492492×4,
=10×4,
=40;
(3)(0.3+0.5)÷0.25×1.2,
=0.8÷0.25×1.2,
=3.2×1.2,
=3.84.
故答案为:1350,40,3.84.
=12.5×111-3×12.5,
=(111-3)×12.5,
=(100+8)×12.5,
=100×12.5+8×12.5,
=1250+100,
=1350;
(2)49.2492492÷1.23123123,
=(49.2492492×4)÷(1.23123123×4),
=49.2492492÷(1.23123123×4)×4,
=49.2492492÷4.92492492×4,
=10×4,
=40;
(3)(0.3+0.5)÷0.25×1.2,
=0.8÷0.25×1.2,
=3.2×1.2,
=3.84.
故答案为:1350,40,3.84.
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