用加减法解下列方程组(1)4m-3n+1=0 2m+6n=7 (2)5x+2y=2 7x-5y=34 (3)3x+y+1=0 3y=2x+19 (4)3x-4y+5=0 5x+2y=9 (5)8x+3y+2=0 6x+5y+7=0 (6)x+1/3-y+2/4=0 x-3/4-y-3/3=1/12

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用加减法解下列方程组(1)4m-3n+1=0 2m+6n=7 (2)5x+2y=2 7x-5y=34 (3)3x+y+1=0 3y=2x+19 (4)3x-4y+5=0 5x+2y=9 (5)8x+3y+2=0 6x+5y+7=0 (6)x+1/3-y+2/4=0 x-3/4-y-3/3=1/12

用加减法解下列方程组(1)4m-3n+1=0 2m+6n=7 (2)5x+2y=2 7x-5y=34 (3)3x+y+1=0 3y=2x+19 (4)3x-4y+5=0 5x+2y=9 (5)8x+3y+2=0 6x+5y+7=0 (6)x+1/3-y+2/4=0 x-3/4-y-3/3=1/12
用加减法解下列方程组
(1)4m-3n+1=0 2m+6n=7 (2)5x+2y=2 7x-5y=34 (3)3x+y+1=0 3y=2x+19 (4)3x-4y+5=0 5x+2y=9 (5)8x+3y+2=0 6x+5y+7=0 (6)x+1/3-y+2/4=0 x-3/4-y-3/3=1/12

用加减法解下列方程组(1)4m-3n+1=0 2m+6n=7 (2)5x+2y=2 7x-5y=34 (3)3x+y+1=0 3y=2x+19 (4)3x-4y+5=0 5x+2y=9 (5)8x+3y+2=0 6x+5y+7=0 (6)x+1/3-y+2/4=0 x-3/4-y-3/3=1/12
前面 为① 后为②
⑴4m-3n+1=0 ① 2m+6n=7② ①﹡2+②算出m 在 算 n
⑵①*5+②*5算出x在 算y
⑶①*3+② 算出x在 算y
⑷ ①+②*2 算出x在 算y
⑸①*5-②*3 算出x在 算y