下面各题，怎样简便就怎样算． 1.2×0.5+3.5×1.2 &nbs...
答案:1 悬赏:70 手机版
解决时间 2021-04-05 02:38
- 提问者网友：城市野鹿
- 2021-04-04 03:11
下面各题，怎样简便就怎样算． 1.2×0.5+3.5×1.2 &nbs...
最佳答案
- 五星知识达人网友：末日狂欢
- 2021-04-04 04:32
（1）1.2×0.5+3.5×1.2
=（0.5+3.5）×1.2
=4×1.2
=4.8
（2）3.5×0.7+5.5×0.7+0.7
=（3.5+5.5+1）×0.7
=10×0.7
=7
（3）6.2×101
=6.2×（100+1）
=6.2×100+6.2
=620+6.2
=626.2
（4）0.125×3.2
=0.125×8×0.4
=（0.125×8）×0.4
=1×0.4
=0.4
（5）21÷0.25÷0.4
=21÷（0.25×0.4）
=21÷0.1
=210
（6）0.83×101-0.83
=0.83×（101-1）
=0.83×100
=83
=（0.5+3.5）×1.2
=4×1.2
=4.8
（2）3.5×0.7+5.5×0.7+0.7
=（3.5+5.5+1）×0.7
=10×0.7
=7
（3）6.2×101
=6.2×（100+1）
=6.2×100+6.2
=620+6.2
=626.2
（4）0.125×3.2
=0.125×8×0.4
=（0.125×8）×0.4
=1×0.4
=0.4
（5）21÷0.25÷0.4
=21÷（0.25×0.4）
=21÷0.1
=210
（6）0.83×101-0.83
=0.83×（101-1）
=0.83×100
=83
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