\(\left(a+b+c\right)^2-2\left(a+b+c\right)\left(b+c\right)+\left(b+c\right)^2\)
\(=\left(a+b+c-b-c\right)^2\)
\(=a^2\)
=.= hok tốt!!
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13 tháng 11 2021 lúc 14:21
rút gọn biểu thức
a. \(\left(a+b+c\right)^2+\left(a+b-c\right)^2-2\left(a+b\right)^2\)
b. \(\left(a^2+b^2-c^2\right)^2-\left(a^2-b^2+c^2\right)^2\)
Rút gọn:\(\frac{\left(b-c\right)^{^3}+\left(c-a\right)^{^3}+\left(a-b\right)^{^3}}{a^2.\left(b-c\right)+b^2.\left(a-c\right)+c^{^2}\left(a-b\right)}\)
Rút gọn ;
\(\frac{a^3\left(b^2-c^2\right)+b^3\left(c^2-a^2\right)+c^3\left(a^2-b^2\right)}{a^2\left(b-c\right)+b^2\left(c-a\right)+c^2\left(a-b\right)}\)
rút gọn: \(\frac{a^3\left(b^2-c^2\right)+b^3\left(c^2-a^2\right)+c^3\left(a^2-b^2\right)}{a^2\left(b-c\right)+b^2\left(c-a\right)+c^2\left(a-b\right)}\)
Rút gọn phân thức:
a/\(\frac{a^2\left(b-c\right)+b^2\left(c-a\right)+c^2\left(a-b\right)}{a^4\left(b^2-c^2\right)+b^2\left(c^2-a^2\right)+c^4\left(a^2-b^2\right)}\)
Rút gọn phân thức:
\(A=\frac{\left(b-c\right)^3+\left(c-a\right)^3+\left(a-b\right)^3}{a^2\left(b-c\right)+b^2\left(c-a\right)+c^2\left(a-b\right)}\)
rút gọn phân thức:
\(S=\frac{a^2\left(b-c\right)+b^2\left(c-a\right)+c^2\left(a-b\right)}{a^4\left(b^2-c^2\right)+b^4\left(c^2-a^2\right)+c^4\left(a^2-b^2\right)}\)
Rút gọn phân thức :
\(\frac{a^3\left(b^2-c^2\right)+b^3\left(c^2-a^2\right)+c^3\left(a^2-b^2\right)}{a^2\left(b-c\right)-b^2\left(c-a\right)+c^2\left(a-b\right)}\)
Rút gọn
\(M=\frac{2}{a-b}+\frac{2}{bc}+\frac{2}{c-a}+\frac{\left(a+b\right)^2+\left(b-c\right)^2+\left(c-a\right)^2}{\left(a-b\right)\cdot\left(b-c\right)\cdot\left(c-a\right)}\)
rút gọn bt
\(\frac{a^2-bc}{\left(a+b\right)\left(a+c\right)}+\frac{b^2-ac}{\left(a+b\right)\left(b+c\right)}+\frac{c^2-ab}{\left(a+c\right)\left(c+b\right)}\)