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五年级数学书121页第四题
3-----4两题
3.6X-X=3.25
解:2.6X=3.25
X=3.25÷2.6
X =1.25
2(X-3)=5.8
解: X-3=5.8÷2
X=2.9+3
X=5.9
(1)3.6x-x=3.25
2.6x=3.25
x=3.25÷2.6
x=1.25
(2)2×(x-2)=2.8
2x-4=2.8
2x=2.8+4
2x=6.8
x=3.4
希望采纳,O(∩_∩)O谢谢
3.6x - x = 3.25
(3.6 - 1)x = 3.25
2.6x = 3.25
x = 3.25 / 2.6
x = 1.25
2(x - 2) = 2.8
x - 2 = 2.8 / 2
x - 2 = 1.4
x = 1.4 + 2
x = 3.4
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