1.8x+5y=10 8x-5y=10 2.3x+2y=9 4x-2y=5 3.2x+3y=5 6x-2y=-6 4.3
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1.8x+5y=10 8x-5y=10 2.3x+2y=9 4x-2y=5 3.2x+3y=5 6x-2y=-6 4.3x+2y=29 4x-5y=19 ,
1.8x+5y=10 (1)
8x-5y=10 (2)
(1)-(2)得:10y=0;
y=0;
x=10/8=5/4;
2.3x+2y=9(1)
4x-2y=5 (2)
(1)+(2)得:7x=14;
x=2;
y=3/2;
3.2x+3y=5(1)
6x-2y=-6(2)
(2)-(1)×3,得:-11y=-21;
y=21/11;
x=-4/11;
4.3x+2y=29 (1)
4x-5y=19(2)
(1)×4-(2)×3,得:y=59/23;
x=183/23;
8x-5y=10 (2)
(1)-(2)得:10y=0;
y=0;
x=10/8=5/4;
2.3x+2y=9(1)
4x-2y=5 (2)
(1)+(2)得:7x=14;
x=2;
y=3/2;
3.2x+3y=5(1)
6x-2y=-6(2)
(2)-(1)×3,得:-11y=-21;
y=21/11;
x=-4/11;
4.3x+2y=29 (1)
4x-5y=19(2)
(1)×4-(2)×3,得:y=59/23;
x=183/23;
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