问题
解答题
巧解方程. 10×7-5X=7
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答案
(1)10×7-5x=7,
70-5x=7,
70-5x+5x=7+5x,
7+5x=70,
7+5x-7=70-7,
5x÷5=63÷5,
x=12.6;
(2)
:2 3
=x:9,5 6
x=5 6
×9,2 3
x×5 6
=6×6 5
,6 5
x=7
.1 5
巧解方程. 10×7-5X=7
|
(1)10×7-5x=7,
70-5x=7,
70-5x+5x=7+5x,
7+5x=70,
7+5x-7=70-7,
5x÷5=63÷5,
x=12.6;
(2)
:2 3
=x:9,5 6
x=5 6
×9,2 3
x×5 6
=6×6 5
,6 5
x=7
.1 5