问题
解答题
解方程.
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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)
x+1 3
x=1 2
,5 6
x=5 6
,5 6
x×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.