题目内容

【题目】解方程

(1)28.25﹣X=8.25,

(2)X﹣(3.6+2.97)=12.42,

(3)x+30%x=26,

(4)÷x=

(5)14.5=5.5,

(6)x﹣80%x=48,

(7)75%x﹣5×=6,

【答案】x=20 x=18.99 x=20 x= x=160 x=240 x=12

【解析】

(1)28.25﹣X=8.25,

解:28.25﹣X+X=8.25+X,

X+8.25=28.25,

X+8.25﹣8.25=28.25﹣8.25,

X=20;

(2)X﹣(3.6+2.97)=12.42,

解:X﹣6.57=12.42,

X﹣6.57+6.57=12.42+6.57,

X=18.99

(3)x+30%x=26

解:130%x=26

1.3x=26

1.3x÷1.3=26÷1.3

x=20

(4)÷x=

解:÷x×x=×x,

x=

=÷

x=×

x=

(5)14.5=5.5,

解:14.5+14.5=5.5+14.5,

=20,

×8=20×8,

x=160

(6)x﹣80%x=48,

解:(1﹣0.8)x=48,

0.2x=48,

0.2x÷0.2=48÷0.2,

x=240;

(7)75%x﹣5×=6,

解:0.75x﹣3=6,

0.75x﹣3+3=6+3,

0.75x=9,

0.75x÷0.75=9÷0.75,

x=12

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