解方程:(1)25%x+3.75=12;(2)x:5/14=21:5/8
解方程:(1)25%x+3.75=12;(2)x:5/14=21:5/8
25%x+3.75=12
x+15=48
x=48-15
x=33
.
x:5/14=21:5/8
14x/5=21*8/5
14x=21*8
x=3*4=12
(1)25%x+3.75=12
25%x=12-3.75
1/4x=12-15/4
1/4x=33/4
x=33
(2)x:5/14=21:5/8
5/8x=5/14*21
5/8x=15/2
x=15/2÷5/8
x=12
(1)25%x+3.75=12
x+15=48
x=48-15
x=33
(2)x:5/14=21:5/8
5x/8=21.5×5/14
x/8=4.3/14
x=34.4/14=86/35
热门标签: