七年级数学解一元一次方程练习题及答案 (1) (2) (3)(4) (5)(6) (7) (8). (9)5x+2=7x-8; (10); (11) (12) ( 13 ) ; (14) (15)(16) (17)(18) (19) (20). (21)(22)2(2x-1)-4(4x-1)-5(2x+1)-19=0 (23) (24) (25) (26)2{3[4(5x-1)-8]-20}-7=1 (27)2(0.3x-4)-5(0.2x+3)=9 (28)2[(x+3)-2(x+1)]-5=0 (29)3x- (30) (31) (32)3x=2x+5 (33)2y+3=y-1 (34)7y=4-3y (35)-(36)10x+7=12x-5-3x = (37)8x―4+2x= 4x―3 (38).2(3x+4)=6-5(x-7) (39). (40) (41) (4 2 ) (43) (44). x- = -1 (45). -= (46) 3 (x+2 )- (2x-3)=2(2x-3)- (x+2) { [( x-2)-2]}-2=0 (47). (48)、5 (y+8 )―5 = 4 (2 y―7 ); (49)、 (50)、 (1)x =2;(2)x =—2;(3)x =7;(4)x =1; (5)x =—5;(6)x =;(7)x =;(8)x =. (9)x =5;(10);(11)x =3;(12); (13)x =0;(14)x =6;(15);(16). 17. 18. 19 20 21. x =8 22.x=-1 23.x=-3 24.x=9 25.x= 26.x=1 27、x=-80 28、x=- 29、 30、24.96 31、x=1 32)x=5 33)y=-4 34)y= 35)y=- 36)x=-12 37)x= 38.x=3 39.x=- 40.x= 41. (42)=6 ; (43)=-2 ; 44. 45. 46. 47. x=186 48、 y = 21 49、x =; 50、x =;