1、7 2x+5y=19 6.x+2y56 7.5x+7y22 8.5x+5y203 9.8x+4y10.5x+7y44 11.7x+5y38 12.x+8y29 13.3x+6y46 14.9x+2y36 15.9x+4y7x+4y=42 16.9x+7y135 17.3x+8y27 18.9x+3y95 19.9x+2y18 20.5x+5y45 7x+9y=69 21.8x+2y22.x+6y23.7x+4y26 24.5x+4y74 25.7x+y16 26.6x+6y42 27.8x+2y11 28.4x+9y94 29.6x+8y7x+2y47 2X+30 -3X+50 2、2X-1
2、X+20 3、5X+63X 8-7X4-5X 4、2(1+X)3(X-7) 4(2X-3)5(X+2) 5、2X4 X+30 6、1-X0 X+20 7、5+2X3 X+28 8、2X+40 1/2(X+8)-20 9、5X-23(X+1) 1/2X+13/2X-3 10、1+1/2X2 2(X-3)43x(x+5)3x2+7 x-4 4(2x-9) 3x-74x-4 2x-3x-36 0.4(x-1)0.3-0.9x 2x-6 x-2 310x98 2x-3x+36 2x-3x+16 2x-3x+31 2x-197x+31 3x-2(9-x)3(7+2x)-(11-6x) 2(3x-1)-3
3、(4x+5)x-4(x-7) 2(x-1)-x3(x-1)-3x-5 15-(7+5x)2x+(5-3x) 5X+63X 2X+40 5X-23(X+1) 2(X-3)4 5m-30 2x-3(x-1) 6 6x-3(x-1) 12-2(x+2) 3(1-3x) 2(3x-2) 3-3m-2m 5x+3x2 -3y+97 (3+8)x6 5-3/1 x5 11x-5x3 -3a-9a11 -4a+96 33x+331 5b-99b 6x+83x+8 3x-74x-42x-197x+31 3x-2(9-x)3(7+2x)-(11-6x) 2(3x-1)-3(4x+5)x-4(x-7) 2(x-1)-x3(x-1)-3x-5 3y-2(y-7)4y 15-(7+5x)2x+(5-3x)3*10x7(x+3)7x2X-1 2(1+X)3(X-7) 2X4 1-X0 5+2X3 1+1/2X2