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1、解一元一次方程的练习题解下列方程:(每题4分)(1)3(x-2)=2-5(x-2) (2) 2(x+3)5(1x)=3(x1) (3) (4) (5) =+1 (6) (7) (8) (9 ) (10) (11) (12) (13) (14) (15) (16) (17) (x-3)=2-(x-3) (18) (19) (20) (21) (22) (23) (24)(3y+7)=2 - y(25)设k为整数,方程kx=4-x的解x为自然数,求k的值。 XX121 5X3 X126X5 =13.4 3X=X= XX= 4X6=2 X= X = X = X = 4x3 9 = 29 x + x
2、= 4X21=4 6X5 =13.4 X-X= 46385X= X= X=X=12 X= X=X= X-0.25= =30% 4+0.7X=102 X+X=42 X+X=105 X-X=400 X-0.125X=8 = X+X=18 X( + )= x0.375x= x+=4 XX12 5 X2.4580.365- x = (x- 4.5) = 7 x- 25%x = 10x- 0.8x = 16+6 20 x 8.5= 1.5 x- x -4= 21 X25%X=90 XX= 一、解方程: (1) 3.5X1.812.3 (5) XX21 (6) XX(7) 3.6X22.16 (8) XX
3、 (2) 0.8X41.6 (3) 5X210 (4) X0.25X3 (9) XX(10) X (11) 2X7X (12) X(13) X (14) X (15) X10(16) 1806X330 (17) 2.2X110 (18) X0.8X10(19) 15X260 (20) 4XX3.15 (21)3.4X1.88.6(22) 5XX2.4 (23) 1.5XX1 (24) 6.6X6X1.8 练习二1、12-3(9-x)=5(x-4)-7(7-x); 2、6x-17=13 3、9-10x=10-9x 4、2(x1)=4 5、13x-26=13 6、755x=70 7、2(6x-2)
4、=8 8、25x(12-6)=300 9、24x+12=132 10、56=12x+8 11、2x+4=30 12、12x=11x79 13、13x12(x+2)=0 14、6712x=7 15、(x-1)(3x+2)= - (x-1) 16、18x-16x+181+50=70 17、14(60-x)2=20x 18、4x+9(x+2)=200 19、100(x+1)+10x+(3x-2)+100(3x-2)+10x+(x+1)=1171 20、5x+4.5(103-x)=486 练习三(1)2x+8=16 (2)x/5=10 (3)x+7x=8 (4)9x-3x=6 (5)6x-8=4 (6
5、)5x+x=9 (7)x-8=6x (8)4/5x=20 (9)2x-6=12(10)7x+7=14 (11)6x-6=0 (12)5x+6=11(13)2x-8=10 (14)1/2x-8=4 (15)x-5/6=7(16)3x+7=28 (17)3x-7=26 (18)9x-x=16(19)24x+x=50 (20)6/7x-8=4 (30)3x-8=30 (31)6x+6=12 (32)3x-3=1 (33)5x-3x=4 (34)2x+16=19 (35)5x+8=19 (36)14-6x=8 (37)15+6x=27 (38)5-8x=4 (39)7x+8=15 (40)9-2x=1
6、 (41)4+5x=9 (42)10-x=8 (43)8x+9=17 (44)9+6x=14 (45)x+9x=4+7 (46)2x+9=17 (47)8-4x=6 (48)6x-7=12 (49)7x-9=8 (50)x-56=1 (51)8-7x=1 (52)x-30=12 (53)6x-21=21 (54)6x-3=6 (55)9x=18 (56)4x-18=13 (57)5x+9=11 (58)6-2x=11 (59)x+4+8=23 (60)7x-12=8 (61)X-5.7=2.15 (62)15.5X-2X=18 (62)3X 0.7=5 (63)3.52= 4.2 x (64)
7、261.5= 2x (65)0.516160.2=4x (66)9.25X=0.403 (67)16.9X=0. 3 (68)X0.5=2.6 (69)x1333 (70)3 5x80 (71)1.8- 6x54 (72)6.7x 60.36.7 (73)9 4x 40 (74)0.2x0.40.53.7(75)9.4x0.4x16.2 (76)12 4x20 (77)1/3 x5/6 x1.4 (78)12 x34 x=1(79)18x14 x= 12 (80)23 x514 = 14 (81)12 34 x=56 (82)2214 x= 12 (83)23 x14 x= 14 (84)x14 x= 65 (85)23 x=14 x 14 (86)30 x12 x 14 x=1 1