五、分数四则混合运算
分数四则混合运算
1: 3/8 12 1/2
9/20 36 2/3
2/5 1/6 1/100
2: 5/12+2/3×3/4
= 5/12+1/2
= 5/12+6/12
= 11/12
3÷(5/7-3/14)
= 3÷(10/14-3/14)
= 3÷1/2
= 6
(28+2/7×7/8)×1/4
=(28+1/4)×1/4
= 28×1/4+1/4×1/4
=
3:(3/5+1/3)×15
= 3/5×15+1/3×15
= 9+5
= 14
7/13×4/5+6/13÷5/4
= 7/13×4/5+6/13×4/5
= 4/5×(7/13+6/13)
= 4/5×1
= 4/5
(7/24-3/16)÷1/8
=(14/48-9/48)×8
= 5/48×8
= 5/6
9/5-(2/5÷1/2+3/7)
= 9/5-(2/5×2+3/7)
= 9/5-(4/5+3/7)
= 9/5-4/5-3/7
= 1-3/7
= 4/7