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0.5/X=3/0.8

0.5/x=3/0.83X=0.4X=2/15

0.5/X=3/0.8解:3X=0.5*0.83Ⅹ=0.4Ⅹ=0.4÷3Ⅹ=2/15

x分之0.5等于3/0.8x=0.5/(3/0.8)=0.5x0.8/3=2/15x的值是15分之2

4/3

(1) 0.5 X = 3 0.8 , 3X=0.5*0.8,3X÷3=0.4÷3, X= 2 15 ;(2)X:3.25= 1 5 : 5 4 , 5 4 X=3.25* 1 5 , 5 4 X* 4 5 =0.65* 4 5 , X=0.52.(3) 3 4 :X=3:12, 3X=12* 3 4 ,3X÷3=9÷3, X=3;(4) 0.7 X = 14 5 , 14X=0.7*5, 14X÷14=3.5÷14, X=0.25.

0.5/x=3/0.8, 0.5*0.8=3x, x=0.4/3=2/15.

0.5/X=3/0.83X=0.4X=0.4/3X=2/15

0.5:x=3/4:1.2,比例式内相乘积等于外相乘积,0.5*1.2=0.75*X得0.6=3/4*X,X=0.6/0.75=0.8 所以,X=0.8

3.6x0.5一0.75x=0.81.8-0.75x=0.8-0.75x=0.8-1.8-0.75x=-1 x=1/0.75 x=4/3

3.6*0.5-0.75x=0.81.8-0.75x=0.80.75x=1.8-0.80.75x=14分之3x=1x=3分之4

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