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Junior high school 100 one-dimensional linear equation problem
1 、( x- 1.5- 1)/4 =(x- 1.5+ 1)/5 .

Solution: 5(x-2.5)=4(x-0.5), x=-2+ 12.5, x= 10.5.

2、l+300=30v .

Solution: 300-l= 10v, v= 15m/s, l= 150m.

3、80x+80y=400。

Solution: 80y-80x=400, so x=0 and y=5.

4 、[ x-4 *( 18-x-y)/60]/4 =( 18-y)/60 .

Solution: y/4 = (18-x)/60+(18-x-y)/60, so x=2 y=2.

5、x=4y .

Solution: 3x+ 1 1-x-y=25, x=8, y=2.

6 、( x-2) 12=8x .

x=6 .

7、x+y=4/5.2。

X-y=4/6.5, and the solution is: X = 9/ 13, y =113.

8、5*( 1/3)+5*X= 15*X .

x= 1/6 .

9 、( 1/3)x/ 12 =( 1/3)x/[ 12 *(5/4)]+ 1 .

After simplification: (5/3)x=(4/3)x+60, (1/3)x=60, x= 180.

10、2X+5X= 14000。

7X= 14000、X=2000、2X=4000、5X= 10000?

1 1、x+(35-20)* 1.5% x = 1323 x = 1080。

12、2x- 10.3x= 15。

13、0.52x-( 1-0.52)x=80 .

14、x/2+3x/2=7 .

15、3x+7=32-2x .

16、3x+5( 138-x)=540 .

17、3x-7(x- 1)=3-2(x+3)。

18、 18x+3x-3 = 18-2(2x- 1).?

19、3(20-y)=6y-4(y- 1 1)。

20 、( x/4- 1)=5 .

2 1、3[4(5y- 1)-8]=6 .

22、3X+ 189=52 1 .

23、4Y+ 1 19=22 .

24、3X* 189=5 .

25、8Z/6=458 .

26、3X+77=59 .

27、4Y-6985=8 1 .

28、87X* 13=5 .

29、7Z/93=4 1 .

30、 15X+863-65X=54 .?

3 1、58Y*55=27489。

32、3X+ 18=52 x=34/3 .

33、4Y+ 1 1 = 22y = 1 1/4。 ?

34、3X*9=5 x=5/27 .

35、8Z/6=48 z=36 .

36、3X+7=59 x=52/3 .

37、4Y-69=8 1 y=75/4 .

38、8X*6=5 x=5/48。

39、7Z/9=4 y=63/7。

40、 15X+8-5X=54 x=4.6 .?

4 1、5Y*5=27 y=27/40。 ?

42、8x+2= 10 x= 1 .

43、x*8=88 x= 1 1 .

y-90= 1 y=9 1 .

45、2x-98=2 x=50 .

46、6x*6= 12 x= 1/3。 ?

47、5-6=5x x=- 1/5 .?

48、6*x=42 x=7 .

49、55-y=33 y=22 .

50、 1 1 * 3x = 60x = 20/ 1 1 .

5 1、8-y=2 y=-6 .

52、x+2=3 .

53、x+32=33 .

54、x+6= 18 .

55、4+x=47 .

56、 19-x=8 .

57、98-x= 13 .

58、66-x= 10 .

59、5x= 10 .

60、3x=27 .

6 1、7x=7 .

62、8x=8 .

63、9x=9 .

64、 10x= 100。

65、66x=660。 ?

66、7x=49 .

67、2x=4 .

68、3x=9 .

69、4x= 16 .

70、5x=25 .

7 1、6x=36 .

72、8x=64 .

73、9x=8 1 .

74、 10x= 100。

75、 1 1x = 12 1 .

76、 12x= 144。

77、 13x= 169。

78、 14x= 196。

79、 15x=225 .

80、 16x=256 .

8 1、 17x=289 .

82、 18x=324 .

83、 19x=36 1 .

84、20x=400 .

85、2 1x=44 1 .

86、22x=484 .

87、 1 1 1x = 1232 1 .

88、 1 1 1 1x = 123432 1 .?

89、 1 1 1 1 1x = 12345432 1 .?

90、 1 1 1 1 1 1x = 1234565432 1 .?

9 1、46/x=23 .

92、64/x=8 .?

93、99/x= 1 1 .?

94、 1235467564x=0 .?

95、2x+ 1= -2+x .

96、4x-3(20-x)=3 .?

97 、-2(x- 1)=4 .?

98、3X+ 189=52 1 .

99、4Y+ 1 19=225 .

100、3X+77=59 .

Extended data:

The solution of one-dimensional linear equation;

First of all, the solution of one-dimensional linear equation is relatively simple:

1, denominator (if it is a fractional equation).

2. Remove the bracket.

3. Move the term containing the unknown element (x) to one side of the equal sign (usually on the left side of the equal sign), and put the remaining term (constant term or letter term) on the other side (right side) of the equation.

4. Merge similar projects.

5. Divide the terms on both sides of the equation by the unknown coefficient, and its quotient is the solution of the equation.

Second, the solution steps of binary linear equations:

For ax+by = c- this is the standard formula of binary linear equation. Y=(c-ax)/b, obviously, its solution is uncertain. So the so-called solution of binary linear equations refers to the solution of binary linear equations.

The method is to eliminate an unknown as far as possible, so that the equations can be solved as one-dimensional linear equations.

There are two ways to eliminate the unknown.

Algebraic addition (1), also known as addition, subtraction and elimination (unknown) method.

(2) substitution method.