Question

方程组 2分之m+3分之n=13 3分之m-4分之n=3

Answer 1

m/2 +n/3 =13①

m/3 -n/4 =3②

①×1/3,②×1/2得

m/6 +n/9 =13/3③

m/6 -n/8 =3/2④

③-④得 n/9 +n/8=13/3 -3/2

解得n=12 代入①得m=18

∴m=18.n=12