解方程组:
(1)用代入法解:3x-2y=8 x-2y=4
;
(2)x2-y+13=1 3x+2y=10
;
(3)52x+23y=-21 x3-y9=-1
;
(4)x+y+z=0 x-2y-3z=-5 2x-3y-z=-12
.
3 x - 2 y = 8 |
x - 2 y = 4 |
x 2 - y + 1 3 = 1 |
3 x + 2 y = 10 |
5 2 x + 2 3 y = - 21 |
x 3 - y 9 = - 1 |
x + y + z = 0 |
x - 2 y - 3 z = - 5 |
2 x - 3 y - z = - 12 |
【答案】(1)
;
(2)
;
(3)
;
(4)
.
x = 2 |
y = - 1 |
(2)
x = 3 |
y = 0 . 5 |
(3)
x = - 6 |
y = - 9 |
(4)
x = - 2 |
y = 3 |
z = - 1 |
【解答】
【点评】
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发布:2024/5/27 14:0:0组卷:338引用:2难度:0.5