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

Toán Lớp 8: Bài 2: Rút gọn biểu thức: a) A = (5a + 5)2 + 10(a – 3)(1 + a) + a2 – 6a + 9;

Toán Lớp 8: Bài 2: Rút gọn biểu thức:
a) A = (5a + 5)2 + 10(a – 3)(1 + a) + a2 – 6a + 9;

Comments ( 2 )

  1. #tnvt
    A=(5a+5)^2+10(a-3)(1+a)+a^2-6a+9
    =[5(a+1)]^2+2.5(1+a).(a-3)+(a-3)^2
    =[5(a+1)+(a-3)]^2
    =(5a+5+a-3)^2
    =(6a+2)^2
    =(6a)^2+2.6a.2+2^2
    =36a^2+24a+4
     

  2. Đánh giá cho mik nhé. Chúc bn học tốt:3
    toan-lop-8-bai-2-rut-gon-bieu-thuc-a-a-5a-5-2-10-a-3-1-a-a2-6a-9

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