解比例练习一、 解比例25 ：7=X ：35 514 ：35= 57 ：x 23 ：X= 12： 14 X ：15=13 ：56 34 ：X= 54 ：2 X ：0.75 = 81 ：25= x:10=: 0.4:x=1.2:2 = :=:x 0.8:4=x:8 :x=3:12 2.8:4.2=x:9.6 :x=: 1.25:0.25=x:1.6 46 2008 101- 64.2870.6421300 25100 2.42+4.58434.253(21) 3.83.93.90.10.13.9 +0.6 二、根据下面的条件列出比例，并且解比例1 96和X的比等于16和5的比。 2 45 和X的比等于25和8的比。3 两个外项是24和18，两个内项是X和36 。二、 解比例 6.5：3.25：4 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=18:262.8:4.2=x:9.6 :x=: x:24= : 8:x=: :=x: 0642.4x 6x x x x0.71050x40 1.3x5.220 x3.6618 x 解方程X X= 2X + = 70%X + 20%X = 3.6X=20 25% + 10X = X - 15%X = 68XX121 5X3 X126X5 =13.4 3X=X= XX= 4X6=2 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=105X-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= X X= 2X + = 70%X + 20%X = 3.6 X=2025% + 10X = X - 15%X = 68 XX121 5X3 X12 6X5 =13.4 3X= X= XX= 4X6=2 X= X = X = X = 4x3 9 = 29 x + 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+=4 XX12 5 X2.458 0.365- x = (x- 4.5) = 7 x- 25%x = 10 X25%X=90 x- 0.8x = 16+6 20 x 8.5= 1.5 x- x -4= 21 XX= X X= 2X + = 70%X + 20%X = 3.6 X=20 25% + 10X = X - 15%X = 68 XX121 5X3