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1.5x%x=24 怎么解方程

80%x-5/2=1.5 x=(5/2+1.5)/80% =4/80% =5 25%x+9%x=3.4 x=3.4/(25%+9%) =3.4/0.34 =10

(1) 1 3 (X+1.5)=12.5, 1 3 (X+1.5)÷ 1 3 =12.5÷ 1 3 , X+1.5=37.5, X+1.5-1.5=37.5-1.5, X=36;(2)x-28%x=21.6, 0.72x=21.6,0.72x÷0.72=21.6÷0.72, x=30;(3) 3 4 X- 5 8 X= 3 4 , 1 8 X= 3 4 , 1 8 X÷ 1 8 = 3 4 ÷ 1 8 ,...

0.8%x+1.5%=1%(x+y)两边同乘于100得 0.8x + 1.5 = x+y 0.2x + y = 1.5 (1) x+y=21 (2) (2)-(1)得 0.8x = 19.5 x = 24.375 代入(2)得 y = -3.375

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