用适当的方法解下列方程组. (1) 3x-y=10 2x-3y=9 (2) 2p-3q=13 -p+5=3q (3) 3m-2n=5 4m+2n=9 (4) 3x+5y=25 4x+3y=15 (5) 3x-5y=7 4x+2y=5 (6) x 2 - y+1 3 =1 3x+2y=4 (7) m 2 + n 3 =13 m 3 - n 4 =3 (8) 1 5 x+ 1 3 y= 2 5 0.5x-0.3y=0.2 (9) 2x-1 5 + 3y-2 4 =2 3x+1 5 - 3y+2 4 =0 (10) y+1 4 = x+2 3 2x-3y=1 .