Question

1.2 +1.3 +1.4 +1.5 +1.6,一直加到2.8,怎么简便运算？

Answer 1

1.2+1.3+1.4+1.5+1.6+...+2.8简便计算方法

=4*7*2

=28+2

=30

Answer 2

1.2+1.3+1.4+...+2.8简便计算

=4×7+2

=30

Answer 3

1.2+1.3+1.4+1.5+1.6+...+2.7+2.8简便计算
=(1.2+2.8)+(1.3+2.7)+...+(1.9+2.1)+2
=4*7+2
=30

Answer 4

1.2 +1.3 +1.4 +1.5 +1.6,一直加到2.8,简便运算如下：
（1.2+2.8）x17/2
=4x17/2
=34

Answer 5

1.2+1.3+…+2.8
=（1.2+2.8）+（1.3+2.7）+…+（1.9+2.1）+2.0
=2.0*（（2.8-1.2）/0.1+1）
=2.0*17
=34.0