Question

递等式简便运算的3.5×3.2+72×0.65的简便方法是什么？

Answer 1

原式=3.5×3.2+（70+2）×0.65
=3.5×3.2+70×0.65+2×0.65
=3.5×3.2+3.5×2×6.5+2×0.65
=3.5（3.2+13）＋1.3
=3.5×16.2+1.3
=35+21.7+1.3
=35+23
=58

Answer 2

简便运算就是凑整
先运算看看
3.5×3.2+6.5×7.2
=3.5×3.2+6.5×(3.2+4)
=3.5×3.2+6.5×3.2+6.5×4
=(3.5+6.5)×3.2+26
=10×3.2+26
=32+26
=58

Answer 3

还是直接运算最简便。
原式=11.2十46.8
=58。

Answer 4

3.5×3.2+72×0.65
=35/10×32/10+72×65/100
=7/2×16/5+72×13/20
=56/5+18×13/5
=56/5+234/5
=290/5
=58