A)x:0,25+x:0,5(x+x:0,01=215 B)17,25-(0,5×x:2-4,2)=15

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A)x:0,25+x:0,5(x+x:0,01=215
B)17,25-(0,5×x:2-4,2)=15

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Gabriella 3 tháng 2021-09-17T06:03:17+00:00 2 Answers 5 views 0

Answers ( )

    0
    2021-09-17T06:04:40+00:00

    `A)x:0,25+x:0,5(x+x:0,01)=215`

    `x*4+x*2(x+x*100)=215`

    `<=>x*4x+x*2+101x=215`

    `<=>4x+202xx=215`

    `<=>4x+202x^2-2515=0`

    `<=>x=-(2-3√4826)/202` hoặc `-(2+3√4826)/202`

    `B)17,25-(0,5×x:2-4,2)=15`

    `<=>0,5*x:2-4,2=2,25`

    `<=>0,5*x:2=6,45`

    `<=>0,5*x=12,9`

    `<=>x=25,8`

    Vậy …………..

    0
    2021-09-17T06:04:49+00:00

    A) x:0,25+x:0,5+x+x:0,01=215
    = x*4+x*2+x*1*100=215
    = x*(4+2+1+100)=215
    = x*107=215
    => x= 2
    B) Ra đ/s kì quá mk chưa làm đc =((

     

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