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\(ab\left(a-b\right)+bc\left(b-c\right)+ca\left(c-a\right)\)
\(=ab\left(a-b\right)+bc\left(b-c\right)-ca\left(a-c\right)\)
\(=ab\left(a-b\right)+bc\left(b-c\right)-ca\left(a-b+b-c\right)\)
\(=ab\left(a-b\right)+bc\left(b-c\right)-ca\left(a-b\right)-ca\left(b-c\right)\)
\(=\left(a-b\right)\left(ab-ca\right)+\left(b-c\right)\left(bc-ca\right)\)
\(=\left(a-b\right)a\left(b-c\right)+\left(b-c\right)c\left(b-a\right)\)
\(=\left(a-b\right)a\left(b-c\right)-\left(b-c\right)c\left(a-b\right)\)
\(=\left(a-b\right)\left(b-c\right)\left(a-c\right)\)
mình làm vội, có chỗ nào sai bạn thông cảm nha
a ( b2 + c2 + bc ) + b ( a2 + c2 + ac ) + c ( a2 + b2 + ab )
= ab2 + ac2 + abc + ba2 + bc2 + abc + ca2 + cb2 +abc
= ( ab2 + a2b + abc ) + ( ac2 + a2c + abc ) + ( bc2 + b2c + abc )
= ab ( a + b + c ) + ac ( a + b + c ) + bc ( a + b + c )
= ( a + b + c ) ( ab + ac + bc )
\(a\left(b^2+c^2+bc\right)+b\left(a^2+c^2+ac\right)+c\left(a^2+b^2+ab\right)\)
\(=ab^2+ac^2+abc+ba^2+bc^2+abc+ca^2+cb^2+abc\)
\(=\left(ab^2+ba^2+abc\right)+\left(bc^2+cb^2+abc\right)+\left(ca^2+ac^2+abc\right)\)
\(=ab\times\left(a+b+c\right)+bc\times\left(a+b+c\right)+ca\times\left(a+b+c\right)\)
\(=\left(a+b+c\right)\times\left(ab+bc+ca\right)\)
\(a\left(b^2-c^2\right)-b\left(a^2-c^2\right)+c\left(a^2-b^2\right)\)
\(=ab^2-ac^2-ba^2+bc^2+ca^2-cb^2\)
\(=\left(ab^2-ac^2-bc^2\right)-\left(ba^2-bc^2-ca^2\right)\)
\(=a\left(b^2-c^2\right)-bc^2-a^2\left(b-c\right)+bc^2\)
\(=a\left(b^2-c^2\right)-a^2\left(b-c\right)\)
\(=a\left(b-c\right)\left(b+c\right)-a^2\left(b-c\right)\)
\(=\left(b+c\right)\left[a\left(b-c\right)-a^2\right]\)
\(=\left(b+c\right)\left(ab-ac-a^2\right)\)
\(a\left(b^2-c^2\right)-b\left(a^2-c^2\right)+c\left(a^2-b^2\right)\)
\(=c\left(a^2-b^2\right)+a\left(b^2-c^2\right)+b\left(c^2-a^2\right)\)
\(=-c\left[\left(b^2-c^2\right)+\left(c^2-a^2\right)\right]+a\left(b^2-c^2\right)+b\left(c^2-a^2\right)\)
\(=\left(a-c\right)\left(b^2-c^2\right)+\left(b-c\right)\left(c^2-a^2\right)\)
\(=\left(a-c\right)\left(b-c\right)\left(b+c\right)+\left(b-c\right)\left(c-a\right)\left(c+a\right)\)
\(=\left(a-c\right)\left(b-c\right)\left(b-a\right)\)
\(a\left(b^2-c^2\right)-b\left(c^2-a^2\right)+c\left(a^2-b^2\right)\)
\(=a\left(b-c\right)\left(b+c\right)-bc^2+ba^2+ca^2-cb^2\)
\(=a\left(b-c\right)\left(b+c\right)-\left(bc^2+cb^2\right)+\left(ba^2+ca^2\right)\)
\(=\left(ab-ac\right)\left(b+c\right)-bc\left(b+c\right)+a^2\left(b+c\right)\)
\(=\left(ab-ac-bc+a^2\right)\left(b+c\right)\)
\(=\left[\left(ab-bc\right)+\left(a^2-ac\right)\right]\left(b+c\right)\)
=\(\left[b\left(a-c\right)+a\left(a-c\right)\right]\left(b+c\right)\)
\(=\left(b+a\right)\left(a-c\right)\left(b+c\right)\)
làm bừa thui,ai trên 11 điểm tích mình mình tích lại
Số số hạng là :
Có số cặp là :
50 : 2 = 25 ( cặp )
Mỗi cặp có giá trị là :
99 - 97 = 2
Tổng dãy trên là :
25 x 2 = 50
Đáp số : 50
đéo biết giải nhé