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1.5x%x=5+5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

0.25+23%x=1.5 0.25+0.23x=1.5 0.23x=1.5-0.25 0.23x=1.25 x=5.4347

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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