四.解下列方程组:23. , 24.. 查看更多

 

题目列表(包括答案和解析)

解下列方程组.
(1)
7x+5y    ①
y=x+3    ②

(2)
3x-2y=5   ①
x+2y=13   ②

(3)
2(x+1)-3(y-1)=10   ①
2(x+1)+7(y-1)=20   ②

(4)
2x-y
5
=
x+y
3
=3

(5)
3(x-1)-2(2y-1)=7   ①
x+2
3
-
1-y
2
=2         ②

(6)
25x+17y=91      ①
17x+25y=35     ②

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解下列方程组:
(1)
x+5
3
+
y+3
2
=7
2x-3
5
-
y-2
3
=0

(2)
x+2y
2
=0.6①
x-2y
2
=-0.4②

(3)
x
2
+
y
3
=2-x①
2x
3
-
y
6
=
y
3
+
17
6

(4)
7+
x-3y
4
=2x-
2x+5
3
10(x-y)-4(1-x)
3
=y

(5)
3x+2y
4
=
2x+5y
3
=
2x+y+2
5

(6)
2x+3y
2
+
3x+2y
5
=
7
2
3(2x+3y)
2
=
2(3x+2y)
3
+
25
6

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用代入法解下列方程组:
(1)
x=2y
x+y=3
(2)
y=1-x
3x+2y=5
(3)
2x-6y=1
x=-3y+5
(4)
3x+5y=5
3x-4y=23

(5)
x-4y=-1
2x+y=16
(6)
3m=5n
2m-3n=1
(7)
x
3
-
y
4
=1
x
2
+
y
3
=2
(8)
x
2
-
y+1
3
=1
3x+2y=0

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解下列方程组:
(1)
x-y=4
2x+y=5

(2)
2x-y=-4
4x-5y=-23.

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解下列方程组或不等式(组):
(1)
0.5x+0.8y=4.7
1.2y+0.6x=6.6

(2)
5x+2
3
+
7x+10
6
3x-2
2

(3)
1-
x+1
2
≤x+2①
x(x+1)>x(x+3)②

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