Đáp án:
Giải thích các bước giải:
Ta có:
VT = a(b-c)-a(b+d)
= a.b - a.c - a.b - a.d
= (a.b - a.b) - (a.c +a.d)
= -a.c - a.d
= -a . (c+d) = VP (đpcm)
VT: vế trái
VP: vế phải
x:(-2)=5 nhaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
Giúp mình giải các câu này với ạ!
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