(0.5x+1)+(0.25x+0.5)+(0.125x+2.25)=x怎么解,
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(0.5x+1)+(0.25x+0.5)+(0.125x+2.25)=x怎么解,
(0.5x+1)+(0.25x+0.5)+(0.125x+2.25)=x怎么解,
(0.5x+1)+(0.25x+0.5)+(0.125x+2.25)=x怎么解,
(0.5+0.25+0.125)x+3.75=x
0.875x+3.75=x
x-0.875x=3.75
0.125x=3.75
x=30
(0.5x+1)+(0.25x+0.5)+(0.125x+2.25)=x
x/2+1+x/4+1/2+x/8+9/4=x
x-x/2-x/4-x/8=1+1/2+9/4
...
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(0.5x+1)+(0.25x+0.5)+(0.125x+2.25)=x
x/2+1+x/4+1/2+x/8+9/4=x
x-x/2-x/4-x/8=1+1/2+9/4
x/8=15/4
x=15/4*8
x=30
我哪算错了吗?就是三十啊
收起
0.5x+1+0.25x+0.5+0.125x+2.25=x
0.5x+0.25x+0.125x+1+0.5+2.25=x
(0.5+0.25+0.125)x+3.75=x
0.7x+3.75=x
3.75=(1-0.7)x
0.3x=3.75
x=12.5我记得答案是32,声明答案是整数- - !算错了。。。答案是30。。。0.875x=3.75确...
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0.5x+1+0.25x+0.5+0.125x+2.25=x
0.5x+0.25x+0.125x+1+0.5+2.25=x
(0.5+0.25+0.125)x+3.75=x
0.7x+3.75=x
3.75=(1-0.7)x
0.3x=3.75
x=12.5
收起
(0.5x+1)+(0.25x+0.5)+(0.125x+2.25)=x
x/2+1+x/4+1/2+x/8+9/4=x
x-x/2-x/4-x/8=1+1/2+9/4
x/8=15/4
x=15/4*8
x=30
不懂可追问,有帮助请采纳,谢谢!