(9 x 8 - 12 - 5 x 12) x (1 x 2 x 3 x 4 x 5)
=(3 x 3 x 2 x 4 - (12 + 12 x 5)) x (1 x 2 x 3 x 4 x 5) (ko có ngoặc vuông.sorry)
=(12 x 6 - 12 x 6) x (1 x 2 x 3 x 4 x 5)
=0 x (1 x 2 x 3 x 4 x5)
=0
giải hệ pt :
\(\hept{\begin{cases}3x^2+6xy+9y^2+\left(x+2y\right)^2\sqrt{x+2y}-3\left(x+2y\right)\sqrt{x+2y}-4\left(x+2y\right)+4\sqrt{x+2y}=0\\\left(\frac{\sqrt[3]{x^2-y^2}}{\sqrt[4]{x}}+\sqrt[4]{\frac{x}{y}}\right)^{2017}+\left(\sqrt[3]{\frac{x}{y}}-\sqrt[4]{\frac{y}{x}}\right)^{2018}=1\end{cases}}\)
\(P=\left(\frac{\sqrt{x}-2}{x-1}-\frac{\sqrt{x}+2}{x+2\sqrt{x}+1}\right)\frac{\left(1-x\right)^2}{2}\)
\(P=\left(\frac{\sqrt{x}-2}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)}-\frac{\sqrt{x}+2}{\left(\sqrt{x}+1\right)^2}\right)\frac{\left(1-x\right)^2}{2}\)
\(P=\left(\frac{\left(\sqrt{x}-2\right)\left(\sqrt{x}+1\right)-\left(\sqrt{x}+2\right)\left(\sqrt{x}-1\right)}{\left(x-1\right)\left(\sqrt{x}+1\right)}\right)\frac{\left(x-1\right)^2}{2}\)
\(P=\left(\frac{\left(x-\sqrt{x}-2\right)-\left(x+\sqrt{x}-2\right)}{\left(x-1\right)\left(\sqrt{x}+1\right)}\right)\frac{\left(x-1\right)^2}{2}\)
\(P=\frac{2\sqrt{x}}{\left(x-1\right)\left(\sqrt{x}+1\right)}\frac{\left(x-1\right)^2}{2}\)
\(P=\frac{\sqrt{x}\left(x-1\right)}{\sqrt{x}+1}=\sqrt{x}\left(\sqrt{x}-1\right)=x-\sqrt{x}\)
1+2+3+4+5+6+7+8+9+5+6={phép này tính nhanh nha}
ai trả lời nhanh mình tích cho
cho: A= [ 0,8.7+(0,8)^2] . (1,25.7 - 4/5 . 1,25) + 31,64,.
B=\(\frac{\text{(1,09-0,29) .5/4}}{\frac{\left(18,9-16,65\right).\frac{8}{9}}{ }}\)Hỏi A gấp mấy lần B
tim x
\(\left(x-1\right)+\left(x-2\right)+\left(x-3\right)=2007\)
Tính nhanh ( 9 x 8 – 12 – 5 x 12 ) x ( 1 + 2 + 3 + 4 + 5)
Tính nhanh:
( 9 x 8 – 12 – 5 x 12 ) x ( 1 + 2 + 3 + 4 + 5 )
Tìm x
\(\left(3x-\frac{1}{4}\right)\left(x+\frac{1}{2}\right)=0\)
(2 điểm) Tính nhanh
a. 4 x 126 x 25
b. (9 x 8 – 12 – 5 x 12) x ( 1 + 2 + 3 + 4 + 5)