Question

32.1×99×2+46.2用简便方法计算？

Answer 1

简便运算主要是通过交换律、结合律，将相关数字交换结合，凑成整数，达到速算目的。
原题目数据有误，达不到简算目的，比如是：
32.1×99×2+64.2
=64.2×99+64.2
=64.2×(99+1)
=64.2×100
=6420

Answer 2

32.1×99×2+64.2
=64.2×99+64.2
=64.2×(99+1)
=64.2×100
=6420

Answer 3

32.1×99×2+46.2
=64.2x99+46.2
=64.2x99+64.2 - 18
=64.2x100 -18
=6420 -18
=6402

Answer 4

23.1x99x2+46.2=23.1x198+46=4619.8
我这个答案是对的