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

Toán Lớp 8: RÚT GỌN BIỂU THỨC : A= (5a+5)^2 + 10.(a-3).(1+a) + a^2 – 6a+9

Toán Lớp 8: RÚT GỌN BIỂU THỨC :
A= (5a+5)^2 + 10.(a-3).(1+a) + a^2 – 6a+9

Comments ( 2 )

  1. A= (5a+5)^2 + 10.(a-3).(1+a) + a^2 – 6a+9
    A=25a^2 + 50a + 25 + 10.(a+a^2-3-3a)+a^2-6a+9
    A=26a^2+44a + 34 + 10a + 10a^2 – 30 – 30a
    A=36a^2 + 24a +4

  2. $\text{A= (5a+5)² + 10.(a-3).(1+a) + a²- 6a+9}$
    $\text{=(5a+5)²+2.5(a+1)(a-3)+(a²-2a.3+3²)}$
    $\text{=(5a+5)²+2(5a+5)(a-3)+(a-3)²}$
    $\text{=(5a+5+a-3)²}$
    $\text{=(6a+2)²}$
    $\text{=36a²+24a+4}$

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