解下列方程.
5X+=X-25%X=24?????????X+×75%=1.
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解:(1)5X+=,
????? 5X+=,
???????? 5X÷5=5,
???????????? X=;
(2)X-25%X=24,
????? 0.75X=24,
0.75X÷0.75=24÷0.75,
????????? X=32;
(4)X+×75%=1,
????????? X+=1,
?????? X+-=1,
???????? =2,
?????????????? X=1.
解析分析:(1)根据等式的性质,在方程两边同时减去,再除以5求解,
(2)先化简,再根据等式的性质,在方程两边同时除以0.75求解,
(3)先化简,再根据等式的性质,在方程两边同时减去,再乘上2求解.
点评:本题考查了学生根据等式的性质解方程的能力,注意等号对齐.