问题 解答题
解方程.
x-25%x=362x+120%×5=16
1
3
x+
1
2
x=
5
6
(1-45%)x=16.5.
答案

(1)x-25%x=36,

0.75x=36,

0.75x÷0.75=36÷0.75,

x=48,

(2)2x+120%×5=16,

2x+6=16,

2x+6-6=16-6,

2x=10,

2x÷2=10÷2,

x=5,

(3)

1
3
x+
1
2
x=
5
6

5
6
x=
5
6

5
6
6
5
=
5
6
×
6
5

x=1,

(4)(1-45%)x=16.5,

0.55x=16.5,

0.55x÷0.55=16.5÷0.55,

x=30.

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