用代入法解:1. 3x+2y=1 6x+7y-2=0 2. 2x-3y=5 2x+y=3 用加减法解: 1.2X+Y=1 3X-Y=4 . 2.X-2Y=1 3X=2Y 3.

2024-12-12 10:39:22
推荐回答(4个)
回答1:

3a+b=5 a+3b=-1 a=2 b=-1;
x=3 y=7 k=5;
a=-13/2;
x=-2 y=1 m=-1;
x=1 y=7 x=2 y=5 x=3 y=3 x=4 y=1;
x+y+3=0 2x-y-1=0 x=-2/3 y=-7/3;
x=5/3 y=3;
第二组为x 2x+3+x=48 x=15 第二组33;

回答2:

3A + B = A +3 B = -1 A = 2 B = -1;
X = 3 Y = K = 5;
= -13 / 2;
所述= -2 Y = M = -1;
X = 1 Y = 7×= 2 Y = 5 X = 3 Y = 3 X = 4,Y = 1;
X + Y +3 = 2X-Y-1 = 0,x = -2 / 3 Y = -7 / 3;

X = 5/3 Y = 3;
组所述2X +3 + X = 48×= 15 33;

回答3:

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回答4:

  1. 7x-3y=0   7x=3y   x:y=3:7