Giúp mình giải câu 2 với

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Giúp mình giải câu 2 với
giup-minh-giai-cau-2-voi

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Latifah 4 years 2020-10-16T00:49:05+00:00 2 Answers 99 views 0

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  1. dangkhoa
    0
    2020-10-16T00:50:45+00:00
    Reply

    `a)2/5+1/5×(-3/4)`

    `=3/5×(-3/4)`

    `=-9/20`

    `b)3/4×26 1/5-3/4×44 1/5`

    `=3/4×(26 1/5-44 1/5)`

    `=3/4×[(26-44)-(1/5-1/5)]`

    `=3/4×[(-18)-0]`

    `=3/4×(-18)`

    `=(3×(-18))/4`

    `=(3×(-9))/2`

    `=-27/2`

    CHÚC BẠN HỌC TỐT!!!

  2. Euphemia
    0
    2020-10-16T00:50:57+00:00
    Reply

    `a, 2/5+1/5·(-3/4)=2/5+(-3/20)=2/5-3/20=8/20-3/20=5/20=1/4`

    `b,3/4·(26+1/5)-3/4·(44+1/5)=3/4·131/5-3/4·221/5`

    `=3/4(131/5-221/5)=3/4(-90/5)=3/4·(-18)=-27/2`

     

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )