解方程.2x+40%x=7.2;5-23x=1314÷6x=27.-数学
题文
解方程. 2x+40%x=7.2; 5-
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答案
(1)2x+40%x=7.2, 2x+0.4x=7.2, (2+0.4)x=7.2, 2.4x=7.2, 2.4x÷2.4=7.2÷2.4, x=3; (2)5-
5-
x=
x=7; (3)
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题文
解方程. 2x+40%x=7.2; 5-
|
答案
(1)2x+40%x=7.2, 2x+0.4x=7.2, (2+0.4)x=7.2, 2.4x=7.2, 2.4x÷2.4=7.2÷2.4, x=3; (2)5-
5-
x=
x=7; (3)
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