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5(x﹣2)+3x=14 5(x+2)+3x=14 5x+3(x+2)=14 5x+3(x﹣2)=14
有最大值-23 有最小值-23 有最大值23 有最小值23
9 14 14-6 14+6 [
2<x<14; x>2; x<14; 7<x<14.
14x+9y-z-15=0 14x-9y十z-15=0 x+9y-z-15=0 14x+9y-z+5=0
14x+9y-z-15=0 14x-9y+z-15=0 x+9y-z-15=0 14x+9y-z+5=0
5(x-2)+3x=14 5(x+2)+3x=14 5x+3(x+2)=14 5x+3(x-2)=14
(x+3)2=14 (x﹣3)2=14 (x+3)2=4 (x﹣3)2=4
(x+3)2=14 (x﹣3)2=14 (x+3)2=11 (x+6)2=14
5x-y-3=0 14x-y-12=0 5x+y-3=0 14x+y-12=0
x2-2x-14=0 x2+2x+14=0 x2+2x-14=0 x2-2x+14=0
5(x﹣2)+3x=14 5(x+2)+3x=14
5x+3(x+2)=14 5x+3(x﹣2)=14
47,XX(X,+21 46,XX(X,-14,+t(14q;2l 45,XX(X,-14,-2l,+t(14q;2l 46,XX(X,-21,+t(2l 46,XX(X,-22,+t(2lq;22