Thẻ: Hoc tap 2022

Đặt \(DM=x;\,BN=y\,\,\left( 0<x,\,y<1 \right)\) Ta có \({{S}_{\Delta AMN}}={{S}_{ABCD}}-{{S}_{\Delta ABN}}-{{S}_{\Delta ADM}}-{{S}_{\Delta CMN}}\)\( =1-\frac{1}{2}\left[ x+y+\left( 1-x \right)\left( 1-y \right) \right]\)\( =\frac{1}{2}\left( 1-xy \right)\) Xét tam giác vuông \(CMN\): \(M{{N}^{2}}\)\( ={{\left( 1-x \right)}^{2}}+{{\left( 1-y \right)}^{2}}\,\,\left( 1 \right)\). Áp dụng định lí \(\cos \( cho tam giác \(\Delta AMN\): \(M{{N}^{2}}\)\( =A{{M}^{2}}+A{{N}^{2}}-2.AM.AN.\cos 45{}^\circ \)\( =1+{{x}^{2}}+1+{{y}^{2}}-\sqrt{2}.\sqrt{{{x}^{2}}+1}.\sqrt{{{y}^{2}}+1}\,\,\,\,\left( 2 \right)\) Từ (1) và (2) suy ra \(\begin{align} & […]

Starfield is set to release in just over two months. Xbox and Bethesda Game Studios have already revealed plenty of information about the game, but fans are still curious to learn more in the months leading up to launch. Recently, a Twitter user asked Bethesda Support about the physical copies of Starfield. The user wanted […]