Toán Lớp 8: Lm trg 2p
a) x^2+32x+256
b) x^2-28x+196
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Toán Lớp 8: Lm trg 2p
a) x^2+32x+256
b) x^2-28x+196
Comments ( 2 )
=x^2+2.x.16+16^2
=(x+16)^2
Áp dụng HĐT số 1:(A+B)^2=A^2+2AB+B^2
b) x^2-28x+196
=x^2-2.x.14+14^2
=(x-14)^2
Áp dụng HĐT số 2:(A-B)^2=A^2-2AB+B^2