Đáp án:
Giải thích các bước giải:
M ==(x+2)(x+4)(x+6)(x+8)(x+2)(x+4)(x+6)(x+8)+16+16
==(x+2)(x+8)(x+4)(x+6)+16(x+2)(x+8)(x+4)(x+6)+16
=(x2+10x+16)(x2+10x+24)+16=(x2+10x+16)(x2+10x+24)+16
=(x2+10x+20−4)(x2+10x+20+4)=(x2+10x+20−4)(x2+10x+20+4) +16+16
=(x2+10x+20)2−16+16=(x2+10x+20)2−16+16
=(x2+10x+20)2
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