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解方程或解比例. x%0.5x=27.5 ...

(1)x-0.5x=27.5, 0.5x÷0.5=27.5÷0.5, x=55;(2)(x-6)×(1+40%)=56, (x-6)×1.4÷1.4=56÷1.4, x-6+6=40+6, x=46;(3)9:x= 1 5 : 1 3 , 1 5 x=9× 1 3 , 1 5 x ÷ 1 5 =3 ÷ 1 5 , x=15.

4:5=x:27 5x=4×27 5x=108 x=108÷5 x=21.6

解: 列式子: 4/5:2/15=X:27 6=X:27 X=27×6 X=162 答案是: 162

15:5=27:x x=27╱3=9

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