50小学五年级分数方程解题

=(0.4×25)×(125×0.8)

=10×100=1000

1.24×8.3+8.3×1.76

=8.3×(1.24+1.76)

=8.3×3=24.9

9999×1001

=9999×(1000+1)

=9999×1000+9999×1

=10008999

14.8×6.3-6.3×6.5+8.3×3.7

=(14.8-6.5)×6.3+8.3×3.7

=8.3×6.3+8.3×3.7

8.3×(6.3+3.7)

=8.3×10

=83

1.24+0.78+8.76

=(1.24+8.76)+0.78

=10+0.78

=10.78

933-157-43

=933-(157+43)

=933-200

=733

4821-998

=4821-1000+2

=3823

I32×125×25

=4×8×125×25

=(4×25)×(8×125)

=100×1000

=100000

百分比互易性

百分比和小数的相互转换

(1)百分制小数:删除百分号，并将小数点向左移动两位。比如75%可以换算成0.75。

(2)十进制百分数:加百分号，小数点右移两位。比如0.62可以换算成62%。