解方程或比例①1-34X=25②x2=0.751.25.-数学

题目简介

解方程或比例①1-34X=25②x2=0.751.25.-数学

题目详情

解方程或比例
①1-
3
4
X=
2
5
x
2
=
0.75
1.25
题型:解答题难度:中档来源:不详

答案

(1)1-class="stub"3
4
x=class="stub"2
5

1-class="stub"3
4
x+class="stub"3
4
x=class="stub"2
5
+class="stub"3
4
x,
class="stub"2
5
+class="stub"3
4
x=1,
class="stub"2
5
+class="stub"3
4
x-class="stub"2
5
=1-class="stub"2
5

class="stub"3
4
x=class="stub"3
5

class="stub"3
4
x÷class="stub"3
4
=class="stub"3
5
÷class="stub"3
4

x=class="stub"4
5


(2)class="stub"x
2
=class="stub"0.75
1.25

1.25x=2×0.75,
1.25x=1.5,
1.25x÷1.25=1.5÷1.25,
x=1.2.

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