数学门诊.(把不对的改正过来)?
(1)1.7×0.31+0.69×1.7
=1.7×(0.31+0.69)×1.7
=1.7×1×1.7
=2.89______
改正:
(2)0.25×12
=0.25×(4×3)
=0.25×4+0.25×3
=1+0.75
=1.75______
改正:
(3)3.5×103
=3.5×100+3
=350+3
=353______
改正:
数学门诊.(把不对的改正过来)?(1)1.7×0.31+0.69×1.7=1.7×(0.31+0.69)×1.7=1.7×1×1.7=2.89______改正:(2)
答案:2 悬赏:40 手机版
解决时间 2021-12-20 00:52
- 提问者网友:椧運幽默
- 2021-12-19 05:27
最佳答案
- 五星知识达人网友:人间朝暮
- 2021-12-19 06:08
解:(1)1.7×0.31+0.69×1.7
=1.7×(0.31+0.69)×1.7
=1.7×1×1.7
=2.89×
改正:1.7×0.31+0.69×1.7
=1.7×(0.31+0.69)
=1.7×1,
=1.7;
(2)0.25×12
=0.25×(4×3)
=0.25×4+0.25×3
=1+0.75
=1.75×
改正:0.25×12
=0.25×(4×3)
=(0.25×4)×3
=1×3,
=3;
(3)3.5×103
=3.5×100+3
=350+3
=353×
改正:3.5×103
=3.5×(100+3)
=3.5×100+3.5×3
=3500+10.5,
=3510.5.
故
=1.7×(0.31+0.69)×1.7
=1.7×1×1.7
=2.89×
改正:1.7×0.31+0.69×1.7
=1.7×(0.31+0.69)
=1.7×1,
=1.7;
(2)0.25×12
=0.25×(4×3)
=0.25×4+0.25×3
=1+0.75
=1.75×
改正:0.25×12
=0.25×(4×3)
=(0.25×4)×3
=1×3,
=3;
(3)3.5×103
=3.5×100+3
=350+3
=353×
改正:3.5×103
=3.5×(100+3)
=3.5×100+3.5×3
=3500+10.5,
=3510.5.
故
全部回答
- 1楼网友:一叶十三刺
- 2021-12-19 07:23
我明天再问问老师,叫他解释下这个问题
我要举报
如以上问答信息为低俗、色情、不良、暴力、侵权、涉及违法等信息,可以点下面链接进行举报!
大家都在看
推荐资讯