Question

｛3u+2t=7,6u-2t=11加减法方程

Answer 1

3U+2T＝7(1)6U－2T＝11(2)

(1)+(2),得9U＝18

U＝2

把U＝2代入(1),

3×2+2T＝7

6+2T＝7

2T＝7－6

2T＝1

T＝1/2