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

Toán Lớp 6: bài 1 tìm x a)200-8*(2x+7)=112 b)(2x-123):3=33 c)-3<_ x <_3

Toán Lớp 6: bài 1 tìm x
a)200-8*(2x+7)=112
b)(2x-123):3=33
c)-3<_ x <_3

Comments ( 2 )

  1. Lời giải chi tiết:
    a) 200-8xx(2x+7)=112
    =>8xx(2x+7)=88
    =>2x+7=11
    =>2x=4
    =>x=2
    Vậy x=2
    b) (2x-123):3=33
    =>2x-123=99
    =>2x=222
    =>x=111
    Vậy x=111
    c) -3\lex\le3
    =>x∈{-3;-2;-1;0;1;2;3}
    Vậy x∈{-3;-2;-1;0;1;2;3}
    @uniquetimehunter

  2. a)200-8xx(2x+7)=112
    =>8xx(2x+7)=200-112
    =>8xx(2x+7)=88
    =>(2x+7)=88:8
    =>2x+7=11
    =>2x=4
    =>x=2
    b)(2x-123):3=33
    =>2x-123=33xx3
    =>2x-123=99
    =>2x=99+123
    =>2x=222
    =>x=222:2
    =>x=111
    c)-3\lex\le3
    =>x\in{-3; -2; -1; 0; 1;2;3}
     

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