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thuymy222nt
2 năm trước
Bài 1:Thu gọn biểu thức sau: a)(a+b+c-d)-(a-b+c-d) b)(-a+b-c+d)+(c+d)-(-b+c) c)-(a-b-d)+(b-c+d)-(-c+b+d) d)a-{(a-3)-[(a+3)-(-a-2)]} e)a+{(a+3)-[(a+3)-(-a-2)]} h)-{-(a+b)-[(a-b)-(a+b)]} Bài 28.Chứng minh đẳng thức sau: 1.-(-a+b+c)+(b+c-1)=(b-c+6)-(7-a+b)+c 2.(-a+b-c+d)+(c+d)-(-b+c) 3.-(a-b-d)+(b-c+d)-(-c+b+d) 4.a-{(a+3)-[(a+3)-(-a-2)]} 5.a+{(a+3)-[(a+2)-(a-2)]} 6.-{-(a+b)-[-(a-b)-(a+b)]} giải hộ mink bài này làm đúng mink vote 5* cho
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