2分之1×29+0.5×31

来源：百度知道 编辑：UC知道 时间：2024/05/30 11:26:03
2分之1×29+0.5×31
29分之17×28
86×85分之7
8分之5×0.42+8分之3×42%
5分之3×0.7+60%×10分之3
4分之1×4分之3+25%×75% 要写过程哦

2分之1×29+0.5×31
=1/2×（29+31）
=1/2×60
=30

29分之17×28
=17/29×（29-1）
=17/29×29-17/29
=17-17/29
=16又29分之12

86×85分之7
=（85+1）×7/85
=85×7/85+1×7/85
=7+7/85
=7又85分之7

8分之5×0.42+8分之3×42%
=（5/8+3/8）×42%
=1×42%
=42%

5分之3×0.7+60%×10分之3
=0.6×(0.7+0.3)
=0.6×1
=0.6

4分之1×4分之3+25%×75%
=1/4×3/4+1/4×3/4
=1/4×(3/4+3/4)
=1/4×3/2
=3/8

2分之1×29+0.5×31
=1/2×（29+31）
=1/2×60
=30

29分之17×28
=17/29×（29-1）
=17/29×29-17/29
=17-17/29
=16又29分之12

86×85分之7
=（85+1）×7/85
=85×7/85+1×7/85
=7+7/85
=7又85分之7

8分之5×0.42+8分之3×42%
=（5/8+3/8）×42%
=1×42%
=42%

5分之3×0.7+60%×10分之3
=0.6×(0.7+0.3)
=0.6×1
=0.6

4分之1×4分之3+25%×75%
=1/4×3/4+1/4×3/4
=1/4×(3/4+3/4)
=1/4×3/2
=3/8

2分之1×29+0.5×31
=0.5×29+0.