问题
解答题
求未知数X.
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答案
(1)
×16-5X=7,9 8
18-5x+5x=7+5x,
18-7=7+5x-7,
11÷5=5x÷5,
x=2.2;
(2)20:40%X=
,2 5
2×40%x=20×5,
80%x=100,
80%x÷80%=100÷80%,
x=125.
求未知数X.
|
(1)
×16-5X=7,9 8
18-5x+5x=7+5x,
18-7=7+5x-7,
11÷5=5x÷5,
x=2.2;
(2)20:40%X=
,2 5
2×40%x=20×5,
80%x=100,
80%x÷80%=100÷80%,
x=125.