Bài 1: Tìm x: a) 5.(3-2x)+5.(x-4)=6-4x b) -3.(x-5)+6.(x+2)=9 c) 10.(x-7)-8.(x+5)=6.(-5)+24 d) -7.(3x-5)+2.(7x-14)=28

Question

Bài 1: Tìm x:
a) 5.(3-2x)+5.(x-4)=6-4x
b) -3.(x-5)+6.(x+2)=9
c) 10.(x-7)-8.(x+5)=6.(-5)+24
d) -7.(3x-5)+2.(7x-14)=28

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Cora 5 tháng 2021-07-16T16:25:21+00:00 2 Answers 4 views 0

Answers ( )

    0
    2021-07-16T16:26:37+00:00

    Đáp án:a)x=-11 ; b)x=-6

     

    Giải thích các bước giải:

     a)5. (3-2x)+5. (x-4)=6-4x

    => 15-10x+5x-20=6-4x

    => 15-10x+5x-20-6+4x=0

    => -11-x=0

    => x=-11

    b)=>-3x+15+6x+12=9

    =>3x+27=9

    =>3x=-18

    =>x=-6

    0
    2021-07-16T16:27:16+00:00

    a) 5. (3-2x)+5. (x-4)=6-4x

    => 15-10x+5x-20=6-4x

    => 15-10x+5x-20-6+4x=0

    => -11-x=0

    => x=-11

    b)-3.(x-5)+6.(x+2)=9

    => -3x+15+6x+12=9

    => -3x+15+6x+12-9=0

    => 3x+18=0

    => 3x=-18

    => x=-6

    c) 10.(x-7)-8.(x+5)=6.(-5)+24

    =>10x-70-8x-40=-6

    => 10x-70-8x-40+6=0

    => 2x-104=0

    => 2x=104

    => x=52

    d)-7.(3x+5)+2.(7x-14)=28

    => -21x-35+14x-28=28

    => -21x-35+14x-28-28=0

    => -7x-91=0

    => -7x=91

    => x=-13

     

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