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2x+x/3=4.2
2x-4/3=4x
人气:461 ℃ 时间:2020-06-20 18:38:16
解答
2x+x/3=4.2
(2+1/3)x=4.2
7/3×x=4.2
x=4.2÷(7/3)
x=1.8
2x-4/3=4x
4x-2x=-4/3
(4-2)x=-4/3
2x=-4/3
x=-4/3÷2
x=-2/3
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