解方程:2x—5/6x=21/40=

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解方程:2x—5/6x=21/40=解方程:2x—5/6x=21/40=解方程:2x—5/6x=21/40=2x—5/6x=21/4012/6x-5/6x=21/407/6x=21/40x=21/40

解方程:2x—5/6x=21/40=
解方程:2x—5/6x=21/40
=

解方程:2x—5/6x=21/40=
2x—5/6x=21/40
12/6x-5/6x=21/40
7/6x=21/40
x=21/40×6/7
x=9/20

2x—5/6x=21/40
(2-5/6)x=21/40
7/6x=21/40
x=21/40÷7/6
x=9/20

2x—5/6x=21/40
12x/6-5x/6=21/40
7x/6=21/40
x=21/40×6/7
x=9/20
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(2-5/6)x=21/40
7/6x=21/40
x=21/40÷7/6
x=9/20