分数简便计算

更新时间2018-10-13 22:47:26

1）2/3+1/4

   =8/12+3/12

   =11/12

2)2-(1/6+1/3)

=2-(1/6+2/6)

=2-1/2

=1又1/2

3)3/8×30+2×3/8

=3/8×（30+2）

=3/8×32

=12

4）8/3-7/9-2/9

=8/3-(7/9+2/9)

=8/3-3/3

=5/3

5)(3/4-3/4×5/6)×12

=3/4×（1-5/6）×12

=3/4×1/6×12

=3/2

6)1/3+1/4-1/3+3/4

=1/3-1/3+（1/4+3/4）

=0+1

=1

7)(1/8+1/4-1/6)×24

=1/8×24+1/4×24-1/6×24

=3+6-4

=5

8）3.72-4/9+2.28-5/9

=3.72+2.28-(4/9+5/9)

=6-1

=5

9)4/9×[3/4-(7/16-3/16)]

=4/9×[3/4-1/4]

=4/9×1/2

=2/9

10)99×97/98

=(98+1)×97/98

=98×97/98+97/98

=97+97/98

=97又97/98