Question

数学题十三点五乘十点一加六点五乘九点九怎样计算才最简便

数学题十三点五乘十点一加六点五乘九点九怎样计算才最简便

Answer 1

=13.5×(10+0.1)+6.5×(10-0.1)
=135+1.35+65-0.65
=200+0.7
=200.7

Answer 2

13.5*10.1+6.5*9.9=（13.5*10+13.5*0.1）+（6.5*10-6.5*0.1）=135+1.35+65-0.65=200.7