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Xһ1حʮح2Xһ1حʮح3Xһ1حʮح4Xһ1lʮح5Xһ1...

൱55һʽľֵλڵ28Сֵ x=1/7 Сֵy=27/7

⣺7x+1=15 7x=14 x=2 40-5.5x=29

;3(5x-2)+54x-6x+1 15x-6+54x-6x-6 15x-4x+6x6-6-5 17x-5 x-5/17 3x+12/17,1-3x22/17 ԭʽ=ح3x+1ح-1-3x(һֵ޷жǷֻǣ2/17Ƿ0δ֪) =ح3x+1ح-1+3x

3xƽʮ2xƽʮ7xһ5xһ6ʮح =(-3x²+2x²)+(7x-5x)+(-6+1) =-x²+2x-5 ʽĸͬͬĸָҲֱͬôͳʽΪͬ -3x²,2x²ͬϲ-x²...

һ3xƽʮ2xƽʮ7xһ5xһ6ʮح =(-3x²+2x²)+(7x-5x)+(-6+1) =-x²+2x-5

/x+2/+(y+3)ƽ=0 x+2=0 y+3=0 x=-2y=-3 5xƽ-3yƽ-(xƽ-yƽ)-(3xƽ+4yƽ) =(5xƽ-xƽ-3xƽ)+(-3yƽ+yƽ-4yƽ) =xƽ-6yƽ =4-69 =4-36 =-32

֪AB={3} ֪3Ƿx^2-mx+15=0ͷx^2-5x+n=0ĸ 3^2-3m+15=03^2-53+n=0 m=8n=6 A={xحx2һmxʮ15=0} ={xحx2һ8xʮ15=0} =35 Bxحx2һ5xn0=xحx2һ5x60={2,3}

żʱ׳ĩΪ2,׳ĩΪ14!!=4x2 5!!=5x3x1 ...һʲô˼񩄩 1 >حһô...

Ҫֶμ㣬: ٵ2x+3

6֮حxʮح2֮حx12֮5xһ50 ⣺3/12x=5/12x-50 5/12x-3/12x=50 1/6x=50 x=300

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