二元一次方程组计算题
二元一次方程组计算题
2xy5x3y5yx3x2y0
(1) (2) (3) (4)
2xy5(5)
3m2n54m2n9 (9)1
x1253y
5
0.5x0.3y0.2
(13)
3(y2)x1
2(x1)5y8
y2x5(6)3x5y7x2y5 4(10)5x2y5a3x4y3ax (14)2
y3
3x4y18
xy1(7)6x5y114x4y7(11)9m2n3nm1 4 (15)xy13
2x3y2
3432
1
x3y1
(8)11x9y12
4x3y5
(12)
2p3q13p54q y1x(16)
2 24x3y3
1
21x23y243(17)
23x21y241
(18)
3x2y2x3y6713x2y2x3y5
(19)
xy
33x2y823
(20)
y5y4x7x3y9
(21)6s275t 3s184t
(25)yx,
y4x15.
(29)
x3y2,
x3y8.
6
7 (22)x3y42 3x4y7
(26)x2y4,2x3y1. (30)
x3y11,3x2y12. x3y4
(23)1 4x1
2y0 (27)x7y0, x9y80.
(31 )2x7y8,
3x8y100.
2
3(24)y2x5 2x3y1 (28)xy3,
xy5.
2x3y7
(32)
3x5y1
ny21x2x3y123xy7m2
(33) (34) (35) (36) 23x2y33x4y175x2y82m3n12
xy1xyxy3x4y18xy5016(37) (38)2 (39) (40) 332
5x3y1xy1803xy2xy283x2y10
mn
2x3y72xy35x2y3,36
(41) (42) (43) (44)
mnyx13x5y11x6y11;244
x3y5
7,3x2y5x23m2n16,2x3y4,23
(45) (46) (47) (48)
2(3x2y)2x83mn1;4x4y3;x42y32.
53
3
11x3y5
xy17,4m2n505x2y3,2233
(49) (50) (51) (52)
x42y33n4m6x6y11;1xy22.
3533
(53)0.4x0.3y0.711x10y1 56)x4y3cd4x3y2dc 3xy4xy60)
4
xyxy2
6154)2
x1y10
53
2x2y7
(57)xy23x2y1 (61)5x2y8, 3xy7;4
(55)2x11y3c6x29y7c(c为常数) (58) 3m2n5m2n9 (59)3x5y7
4
4x2y5
(62)4x7y10,3x2y16x11y280. (63)2x3y8
(
(
(
2x3y5,①x2(x2y)4x22(y1),
(64) (65) (66)
2(x2)(y1)5;
3(xy)4(xy)4
(67)xy
2xy 61
xy(70)
2xy
26 4xy5xy2
(73)7x2y40
8x3y50
x2y2(68)4x3y54x6y14 (71)23x17y63x23y57 175
3x2y7,②69)3x2y62x3y17 (72)
3x4y9x3y10 (
x1y,3xy7,
a:b:c3:4:5,
(74)xyz14, (75) (76)y4z3,
xy2z5.xyz(77)0,4x2yz3, 9x3yz6.
xy6(80)yz8 xz10abc36.xyz11,
(78)
yzx5,
zxy1.zxy81)xyz6 xy36
2x2z5.
x20 (79)xy0
yz0xyz1782)
2xy2z1
3xy4z3
((