六年级上册有哪些简单的运算？

1、24.6-3.98+5.4-6.02

24.6-3.98+5.4-6.02

=(24.6+5.4)-(3.98+6.02)

=30-10

=20

2、27×17/26

27×17/26

=(26+1)×17/26

=26×17/26+1×17/26

=17+17/26

= 17和17/26

3、528-99

528-99

=528-(100-1)

=528-100+1

=428+1

=429

4、1.2×2.5+0.8×2.5

1.2×2.5+0.8×2.5

=(1.2+0.8)×2.5

=2×2.5

=5?

5、2.96×40

2.96×40

=29.6x4

=(30-0.4)x4

=30×4+0.4×4

=120-1.6

=118.4