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解比例 0.7:78

36分之78=x分之16 78x=36*16x=36*16÷78x=7又13分之50.7分之之0.2=x分之0.90.2x=0.7*0.9x=0.7*0.9÷0.2x=3.15

78x=36*16 x=96/13 20/12=6x x=5/18

0.7:x=12:240.7:x=1:2 x=2*0.7 x=1.4 x:7.5=2.1:1.8 18x=21*7.5 x=8.755x:3=10.95x=10.9*35x=32.7 x=6.54

(1)0.7:18=21:x 0.7x=18*21 0.7x÷0.7=378÷0.7 x=540;(2)36 x =48 4 48x=36*448x÷48=144÷48 x=3;(3)1.5:2.5=12:x 1.5x=2.5*12 1.5x÷1.5=30÷1.5 x=20.

0.7:x=48.5/48 解: 48.5x=0.7*48 48.5x=33.6 x=33.6÷48.5 x=0.14

x=0.7*24/12=1.4

0.7x=21*18 x=21*18/0.7 x=540

x=2.1

(1)18:0.7=x:21, 0.7x=18*21, 0.7x=378, 0.7x÷0.7=378÷0.7, x=540;(2)12 2.4 =3 x , 12x=2.4*3, 12x=7.2, x=0.6;(3)1 2 :1 5 =1 4 :x,1 2 x=1 5 *1 4 ,1 2 x=1 20 ,1 2 x÷1 2 =1 20 ÷1 2 , x=1 10 .

① 0.7 x = 14 5 , 14x=0.7*5, 14x÷14=3.5÷4, x=0.25;②0.75: 1 2 =12:x, 0.75x= 1 2 *12,0.75x÷0.75=6÷0.75, x=8;③ 2 15 : 1 6 =x: 2 3 , 1 6 x= 2 15 * 2 3 , 1 6 x ÷ 1 6 = 4 45 ÷ 1 6 , x= 8 15 ;④4:4.5= x 27 , 4.5* x 27 =4, 1 6 x ÷ 1 6 =4÷

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