计算
(1)4x-3(20-x)=3;
(2)x-x-25=2x-53+1;
(3)x0.7-0.17-0.2x0.03=1;
(4)2[43x-(23x-12)]=34x;
(5)3x+y=10 x-y=6
;
(6)x-16-2-y3=1 2(x-1)=13-(y+2)
;
(7)19x+18y=17 17x+16y=15
;
(8)x+y+z=6 x+2y-3z=4 2x-y+z=5
.
x
-
x
-
2
5
=
2
x
-
5
3
+
1
x
0
.
7
-
0
.
17
-
0
.
2
x
0
.
03
=
1
2
[
4
3
x
-
(
2
3
x
-
1
2
)
]
=
3
4
x
3 x + y = 10 |
x - y = 6 |
x - 1 6 - 2 - y 3 = 1 |
2 ( x - 1 ) = 13 - ( y + 2 ) |
19 x + 18 y = 17 |
17 x + 16 y = 15 |
x + y + z = 6 |
x + 2 y - 3 z = 4 |
2 x - y + z = 5 |
【答案】(1)x=9;
(2)x=-8;
(3)x=;
(4)x=-;
(5)
;
(6)
;
(7)
;
(8)
.
(2)x=-8;
(3)x=
14
17
(4)x=-
12
7
(5)
x = 4 |
y = - 2 |
(6)
x = 5 |
y = 3 |
(7)
x = - 1 |
y = 2 |
(8)
x = 3 |
y = 2 |
z = 1 |
【解答】
【点评】
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发布:2024/4/20 14:35:0组卷:2061引用:6难度:0.5