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

Toán Lớp 8: a)(x+5)²-(x+1).(x-1)=16 b)(2x-1) ²+(x+3) ²-5(x+7)(x-7) c)3.(x-1) ³-3x(x-5)=1 d)(6x-2) ²+(5x-2) ²-4(3x-1)(5x-2)+x ²=1 e)(x-2) ³-x ²(x-6)

Home/ Toán Lớp 8: a)(x+5)²-(x+1).(x-1)=16 b)(2x-1) ²+(x+3) ²-5(x+7)(x-7) c)3.(x-1) ³-3x(x-5)=1 d)(6x-2) ²+(5x-2) ²-4(3x-1)(5x-2)+x ²=1 e)(x-2) ³-x ²(x-6)

Toán Lớp 8: a)(x+5)²-(x+1).(x-1)=16 b)(2x-1) ²+(x+3) ²-5(x+7)(x-7) c)3.(x-1) ³-3x(x-5)=1 d)(6x-2) ²+(5x-2) ²-4(3x-1)(5x-2)+x ²=1 e)(x-2) ³-x ²(x-6)

Tháng Chín 9, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: a)(x+5)²-(x+1).(x-1)=16
b)(2x-1) ²+(x+3) ²-5(x+7)(x-7)
c)3.(x-1) ³-3x(x-5)=1
d)(6x-2) ²+(5x-2) ²-4(3x-1)(5x-2)+x ²=1
e)(x-2) ³-x ²(x-6)=4
f)(x-1)(x ²+x+1)-x(x+2)(x-2)=5
Mng giúp em với ạ,pls

Comments ( 1 )

  1. myngocla
    myngocla
    9 Tháng Chín, 2022 at 8:44 chiều
    Reply
    (6x−2)2+(5x−2)2−4(3x−1)(5x−2)=0
    ⇔36×2−24x+4+25×2−20x+4−12x(5x−2)+4(5x−2)=0
    ⇔61×2−44x+8−60×2+24x+20x−8=0
    ⇔x2=0
    ⇔x=0
    3(x−1)2−3x(x−5)=1
    ⇔3(x2−2x+1)−3×2+15x=1
    ⇔3×2−6x+3−3×2+15x=1
    ⇔9x=1−3
    ⇔9x=−2
    ⇔x=−29
    (x−2)3−x2(x−6)=4
    ⇔x3−6×2+12x−8−x3+6×2=4
    ⇔12x=12
    ⇔x=1
    (x−1)(x2+x+1)−x(x+2)(x−2)=5
    ⇔x3−1−x(x2−4)=5
    ⇔x3−1−x3+4x=5
    ⇔4x=6
    ⇔x=32
    (x−1)3−(x+3)(x2−3x+9)+3(x2−4)=0
    ⇔x3−3×2+3x−1−x3−27+3×2−12=0
    ⇔3x−40=0
    ⇔3x=40
    #nguyenvantuan130808 #kocopynha
     

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

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