题目内容

解方程.
1-
3
4
x=
3
5

3
4
1
5
=20:x
x
3.5
=
x-16
1.5

x+(3x-16)÷25%=10(x+1)
(1)1-
3
4
X=
3
5

1-
3
4
X+
3
4
X=
3
5
+
3
4
X
3
5
+
3
4
X-
3
5
=1-
3
5

3
4
3
4
=
2
5
÷
3
4

X=
8
15


(2)
3
4
1
5
=20:X
3
4
X=
1
5
×20
3
4
3
4
=4÷
3
4

X=
16
3


(3)
x
3.5
=
x-16
1.5

3.5(X-16)=1.5X,
3.5X-56=1.5X
3.5X-56+56=1.5X+56
3.5X-1.5X=56
2X=56
X=28,

(4)X+(3X-16)÷25%=10(X+1)
X+(3X-16)×4=10X+10
X+3X×4-16×4=10X+10
13X-64=10X+10
13X-64+64=10X+10+64
13X=10X+74
13X-10X=10X+74-10X
3X=74
X=
74
3
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