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1.2.(x-5)-3.(x-4)=-51 2.(x+2).(x-3)=0 3.-(a-b+c)+(a-b-c)=-2c 4.a.(b+c)-b.(a-c)=c.(a+b) 5.(a+b).(a-c)=a mũ 2-b mũ 2 Đề bài câu 1,2 tìm x Đề bài câu 3,4,,5 chứng minh đẳng thức Ai làm nhanh e vote 5* ạ
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