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1、解方程及解比例练习题解方程及解比例练习题 解比例:解比例: x:10=: 0.4:x=1.2:2 = 4 1 3 1 4 . 2 12 x 3 : =:x 0.8:4=x:8 :x=3:12 2 1 5 1 4 1 4 3 1.25:0.25=x:1.6 = = 9 2 x 8 x 36 3 54 x: =6: = 45:x=18:26 3 2 25 24 x 5 . 4 2 . 2 6 2.8:4.2=x:9.6 :x= : 2.8:4.2=x:9.6 10 1 8 1 4 1 x:24= : 8:x=:=x: 4 3 3 1 5 4 4 3 8 5 6 1 12 1 0 642.4x 6x
2、 1 5 1 3 0.6 12 1.5 x x x x0.7 3 4 1 2 4 5 11 12 4 5 25 36 1 14 1 2 1050 x40 1.3x5.220 x3.6618 x 1 3 1 20 16 9 4.6 0.2 8 x 3 8 x 64 解方程解方程 X X= 2X + = 70%X + 20%X = 3.6X X= 2X + = 70%X + 20%X = 3.6 2 2 7 7 4 3 2 2 5 5 3 3 5 5 X =20 25% + 10X = X - 15%X = 68X =20 25% + 10X = X - 15%X = 68 5 3 4 1 5 4
3、 X X121 5X3 X12X X121 5X3 X12 8 3 21 5 7 5 3 2 4 1 6X5 =13.4 3X=6X5 =13.4 3X= 8 3 4 1 4 3 X 8 3 X= XX= 4X6=2X= XX= 4X6=2 7 2 16 7 8 7 4 3 3 2 X= X = X = X= X = X = 1 12 2 5 5 3 3 1 10 0 5 3 72 25 9 8 6 1 51 16 X = 4x3 9 = 29 x + x = 4X = 4x3 9 = 29 x + x = 4 35 6 45 26 25 13 2 1 6 1 X21=4 X21=4 10 3
4、 3 2 20 4 1 xx8)6 . 2(2x 6X5 =13.4 X- X= 46386X5 =13.4 X- X= 4638 2 2 5 5 1 1 3 3 3 3 1 10 0 5X= X= X=5X= X= X= 19 15 21 8 15 4 5 4 28 15 X=12 X= X=X=12 X= X= 3 2 4 1 5 3 72 25 9 8 6 1 51 16 X= X-0.25= =30% X= X-0.25= =30% 35 6 45 26 25 13 4 1 4 X 4+0.7X=102 X+X=42 X+X=1054+0.7X=102 X+X=42 X+X=105 3
5、 2 2 1 4 1 X- X=400 X-0.125X=8 = X- X=400 X-0.125X=8 = 8 3 X 36 4 3 X+ X=18 X( + )= x0.375x= X+ X=18 X( + )= x0.375x= 3 3 7 7 1 1 6 6 3 3 8 8 1 13 3 1 12 2 6 5 x+=4 x+=4 X 7 3 X12 5 X2.458 3 2 2 1 8 3 0.365- x = (x- 4.5) = 7 x- 25%x = 10 3 4 3 5 2 3 1 2 x- 0.8x = 16+6 20 x 8.5= 1.5 x- x -4= 21 x- x
6、-4= 21 4 4 5 5 X25%X=90 X X= X X= 3 7 8 9 2 7 4 3 2X + = 70%X + 20%X = 3.6 X=20 2 5 3 5 5 3 4 1 25% + 10X = X - 15%X = 68 X X121 5 4 8 3 5X3 X12 6X5 =13.4 21 5 7 5 3 2 4 1 3X= X= 8 3 4 1 4 3 X 8 3 7 2 16 7 XX= 4X6=2 X= 8 7 4 3 3 2 12 5 3 10 X = X = X = 5 3 72 25 9 8 6 1 51 16 35 6 45 26 25 13 4x3 9
7、= 29 x + x = 4 X21=4 2 1 6 1 10 3 3 2 6X5 =13.4 20 4 1 xx8)6 . 2(2x X- X= 4638 5X= 2 5 1 3 3 10 19 15 X= X= X=12 21 8 15 4 5 4 28 15 3 2 4 1 X= X= X= 5 3 72 25 9 8 6 1 51 16 35 6 45 26 25 13 X-0.25= =30% 4+0.7X=102 4 1 4 X X+X=42 X+X=105 X- X=400 3 2 2 1 4 1 8 3 X-0.125X=8 = X+ X=18 X 36 4 3 3 7 X(
8、+ )= x0.375x= x+=4 1 6 3 8 13 12 6 5 3 2 2 1 8 3 X 7 3 X12 5 X2.458 0.365- x = 3 4 3 5 (x- 4.5) = 7 x- 25%x = 10 X25%X=90 2 3 1 2 x- 0.8x = 16+6 20 x 8.5= 1.5 x- x -4= 21 4 5 X X= X X= 2X + = X X= 2X + = 3 7 8 9 2 2 7 7 4 3 2 2 5 5 3 3 5 5 70%X + 20%X = 3.6 70%X + 20%X = 3.6 X =20 25% + 10X = X =20
9、25% + 10X = 5 3 4 1 5 4 X - 15%X = 68X - 15%X = 68 X X121 5X3 X X121 5X3 8 3 21 5 7 5 3X= 3X= 8 3 4 1 4 3 X 8 3 X= XX= 4X6=2X= XX= 4X6=2 7 2 16 7 8 7 4 3 3 2 X= X = X = X= X = X = 1 12 2 5 5 3 3 1 10 0 5 3 72 25 9 8 6 1 51 16 X = 4x3 9 = 29 x + x = 4X = 4x3 9 = 29 x + x = 4 35 6 45 26 25 13 2 1 6 1
10、X21=4 X21=4 10 3 3 2 20 4 1 xx8)6 . 2(2x 6X5 =13.4 X- X= 46386X5 =13.4 X- X= 4638 2 2 5 5 1 1 3 3 3 3 1 10 0 5X= X= X=5X= X= X= 19 15 21 8 15 4 5 4 28 15 X=12 X= X=X=12 X= X= 3 2 4 1 5 3 72 25 9 8 6 1 51 16 X= X-0.25= =30% X= X-0.25= =30% 35 6 45 26 25 13 4 1 4 X 4+0.7X=102 X+X=42 X+X=1054+0.7X=102
11、X+X=42 X+X=105 3 2 2 1 4 1 X- X=400 X-0.125X=8 = X- X=400 X-0.125X=8 = 8 3 X 36 4 3 X+ X=18 X( + )= x0.375x= X+ X=18 X( + )= x0.375x= 3 3 7 7 1 1 6 6 3 3 8 8 1 13 3 1 12 2 6 5 x+=4 x+=4 X 7 3 X12 5 X2.458 3 2 2 1 8 3 0.365- x = (x- 4.5) = 7 x- 25%x = 10 3 4 3 5 2 3 1 2 x- 0.8x = 16+6 20 x 8.5= 1.5 x- x -4= 21 x- x -4= 21 4 4 5 5
