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

Toán Lớp 6: a). (x+3) (2x^2-3x +9) -x (x-1) (x+1)=27 b).6x (5x+3) +3x (1-10x) =7 c). (3x-3) (5-21x)+ (7x+4) (9x-5)=44 d). (x+3) (2x-1) +4 (3x+2) (x

Tháng Một 20, 2023 Toán học 1 Comment 0 views

Toán Lớp 6: a). (x+3) (2x^2-3x +9) -x (x-1) (x+1)=27
b).6x (5x+3) +3x (1-10x) =7
c). (3x-3) (5-21x)+ (7x+4) (9x-5)=44
d). (x+3) (2x-1) +4 (3x+2) (x+3)=38

Comments ( 1 )

  1. quynhthanhnghi
    quynhthanhnghi
    20 Tháng Một, 2023 at 9:18 chiều
    Reply
    $b).6x (5x+3) +3x (1-10x) =7$
    $30x^{2}+18x+3x(1−10x)=7$
    $30x^{2}+18x+3x−30x^{2}=7$
    $30x^{2}$ +21x−$30x^{2}$ =7$
    $21x=7$
    $x=7:21$
    $x=\frac{1}{3}$ 
    $c)(3x−3)(5−21x)+(7x+4)(9x−5)=44$
    $78x−63^{2} −15+(7x+4)(9x−5)=44$
    $78x−63^{2} −15+63^{2}+x−20=44$
    $78x−15+x−20=44$
    $79x−15−20=44$
    $79x−35=44$
    $79x=44+35$
    $79x=79$
    $x=1$
    $Chúc bạn học tốt$ 

    toan-lop-6-a-3-2-2-3-9-1-1-27-b-6-5-3-3-1-10-7-c-3-3-5-21-7-4-9-5-44-d-3-2-1-4-3-2

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

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