Question

分数简便计算怎么做？

（7/8+13/16)÷13/16
1.8×0.72+1.28×1.8
5×4/5÷5×4/5
3×17÷17÷3
（4/9+2/41)×9+23÷41

Answer 1

（7/8+13/16)÷13/16
=（7/8+13/16)×16/13
=7/8×16/13+13/16×16/13
=14/13＋1
=27/13
1.8×0.72+1.28×1.8
=1.8×（0.72＋1.28）
=1.8×2
=3.6
5×4/5×4/5
=（5÷5）×（4/5×4/5）
=16/25
3×17÷17÷3
=（3÷3）×（17÷17）
=1
（4/9+2/41)×9+23÷41
=4/9×9+2/41×9+23/41
=4＋（18/41+23/41）
=4＋1
=5

Answer 2

（7/8+13/16)÷13/16
＝（7/8+13/16)×16/13
=7/8×16/13+13/16×13/16
=14/13+1
=2又1/13

1.8×0.72+1.28×1.8
=1.8×（0.72+1.28）
＝1.8×2
=3.6

5×4/5÷5×4/5
＝5÷5×4/5×4/5
=4/5×4/5
＝16/25

3×17÷17÷3
=3÷3×(17÷17)
=1

（4/9+2/41)×9+23÷41
=4/9×9+2×9/41+23/41
=4+1
=5

Answer 3

1.（7/8+13/16)÷13/16=（14/16+13/16）÷13/16=27/16÷13/16=27/16×16/13=27/13

2.1.8×0.72+1.28×1.8=1.8×（0.72+1.28）=3.6

3.5×4/5÷5×4/5=4/5×4/5=16/25

4.3×17÷17÷3=1/289

5.（4/9+2/41)×9+23÷41=4/9×9+2×9/41+23/41=4+1=5

Answer 4

（7/8+13/16)÷13/16=（14/16+13/16）÷13/16=27/16÷13/16=27/16×16/13=27/13

1.8×0.72+1.28×1.8=1.8×（0.72+1.28）=3.6

5×4/5÷5×4/5=4/5×4/5

3×17÷17÷3=1

（4/9+2/41)×9+23÷41=4/9×9+2×9/41+23/41=4+1=5