(5x-____)^2=____-10xy+y^2

(5x-____)^2=____-10xy+y^2 （____-2)(3x+____)=4-9x² (_____)-10xy+y^2=(5x-____) 函数y=lg(x^2-5x-14)的定义域是____,值域是____ 填空：x²+4x+____ =(x+____)²x²-5x+____ =(x-____)²x²_____+9=(x____)² x²-x____=(x-___)² 4x²+4x+____=(2x+____)² x²-3/5x+x²-x____=(x-___)²4x²+4x+____=(2x+____)²x²-3/5x+____=(x-___)² 二次函数填空（1）y=7x²-14x+1=7（x-____）²+____（2）y=-½x²+2/3x-5/6=-½（x-____)²+____ 已知x ^2+9y ^2-2x+12y+5=0,则x=____,y=____. 已知（2x+5y-4）+|x+5y-7|=0,则x=____,y=____. (2x+____)的平方=4(x的平方)+8x+____ 0____{x|x平方=2x} 填符号 (3x-5y)(10y-6x)=___(___)^2=____. （____）+3x²-5x+2=2x²-4x 2.3x+7.7x=(____+_____)×____ f(x)=2|x-1|+|x-2|+|x-5|+|x-8|+|x-34|,f(x)的最小值是____. 若|x-5|=3,则x=____.若a＞1,则|a-1|=____,|1-2a|=____. x²+2x+m=[x+n][x+10],则m=____,n=____ x²+mx+14=[x+2][x+n],则m=____,n=_____ 当x=____时,式子|3x-1|+5有最小值,最小值是____