Toán Lớp 6: Chứng minh: (a-b)+(c-d)=(a+c)-(b+d)
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Toán Lớp 6: Chứng minh: (a-b)+(c-d)=(a+c)-(b+d)
Comments ( 2 )
=a-b+c-d
=a+c-b-d
=(a+c)-(b+d)