问题
解答题
解方程或比例. ①2x+3×0.9=24.7 ②
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答案
(1)2x+3×0.9=24.7
2x+2.7=24.7
2x+2.7-2.7=24.7-2.7
2X=22
2X÷2=22÷2
X=11
(2)
:x=3 4
:242 5
X=2 5
×243 4
X÷2 5
=18÷2 5 2 5
X=45
解方程或比例. ①2x+3×0.9=24.7 ②
|
(1)2x+3×0.9=24.7
2x+2.7=24.7
2x+2.7-2.7=24.7-2.7
2X=22
2X÷2=22÷2
X=11
(2)
:x=3 4
:242 5
X=2 5
×243 4
X÷2 5
=18÷2 5 2 5
X=45