第1个回答 2012-12-31
21.5减去3个1/2的差除以3/5商是多少
(21.5-3×1/2)÷(3/5)=(21.5-1.5)×5/3=20×5/3=100/3
解方程:2/3+5/6x=3/4
5/6x=3/4-2/3
5/6x=1/12
x=1/10
x减3/5x=24
2/5x=24
x=60
5/7乘3/5除以6/7
=5/7×3/5×7/6
=1/2
5/8除以(2/3除以2/5)
=5/8×3/2×2/5
=3/8
8/13除以7+1/7乘5/13
=8/13×1/7+1/7×5/13
=(8/13+5/13)×1/7
=1×1/7
=1/7
48乘(5/6+7/8)
=48×5/6+48×7/8
=40+42
=82
2除以【(1+2/5)乘3/7】
=2÷(7/5×3/7)
=2÷(3/5)
=10/3
(2/3+1/9)除以(4/5减2/3)
=7/9÷(2/15)
=7/9×15/2
=35/6