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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: timf x a)5(2x-1)-4(8-3x)=7 b)7(2x-5)-5(7x-2)+2(5x-7)=(x-2)-(x+4)

Toán Lớp 8: timf x
a)5(2x-1)-4(8-3x)=7
b)7(2x-5)-5(7x-2)+2(5x-7)=(x-2)-(x+4)

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    a)5(2x-1)-4(8-3x)=7
    <=>10x-5-(32-12x)=7
    <=>10x-5-32+12x=7
    <=>22x-37=7
    <=>22x=44
    <=>x=2
    Vậy x=2.
    b)7(2x-5)-5(7x-2)+2(5x-7)=(x-2)-(x+4)
    <=>14x-35-35x+10+10x-14=x-2-x-4
    <=>-11x-39=-6
    <=>-11x=-6+39=33
    <=>x=-3
    Vậy x=-3.

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222-9+11+12:2*14+14 = ? ( )

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