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1、.解方程及解比例练习题解比例:x:10=: 0.4:x=1.2:2 =:=:x 0.8:4=x:8 :x=3:121.25:0.25=x:1.6 =x:=6:= 45:x=18:26 2.8:4.2=x:9.6 :x=: 2.8:4.2=x:9.6x:24= : 8:x=:=x:0642.4x6xxxx0.71050x401.3x5.220x3.6618 x解方程X X= 2X + = 70%X + 20%X = 3.6X=20 25% + 10X = X - 15%X = 68XX121 5X3X126X5 =13.4 3X=X= XX= 4X6=2X= X = X = X= 4x3 9 =
2、 29 x + x = 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+=4XX125 X2.4580.365- x = (x- 4.5) = 7 x- 25%x= 10x- 0.8x= 16+620 x8.5= 1.5x- x -4= 21 X25%X=90 XX= X X=2X + = 70%X + 20%X = 3.6 X=2025% + 10X = X - 15%X = 68 X
3、X121 5X3X12 6X5 =13.4 3X=X=XX= 4X6=2 X= X = X = X=4x3 9 = 29x + x = 4 X21=4 6X5 =13.4 X-X= 4638 5X=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+=4XX125 X2.4580.365- x = (x- 4.5) = 7 x- 25%x= 10 X25%X=90 x- 0.8x= 16+620 x8.5= 1.5x- x -4= 21 XX= X
4、 X= 2X + = 70%X + 20%X = 3.6X=20 25% + 10X = X - 15%X = 68XX121 5X33X=X= XX= 4X6=2X= X = X = X= 4x3 9 = 29 x + x = 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+=4XX125 X2.4580.365- x = (x- 4.5) = 7 x- 25%x= 10x- 0.8x= 16+620 x8.5= 1.5x- x -4= 21 . v
