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{3,–1} 3,–1 (3,–1) {(3,–1)}
x x<-2 x x>3 x -1<x<2 x 2<x<3
x x<-2 x x>3 x -1<x<2 x 2<x<3
20600÷(1+3%)x3%+123600x2% 20600÷(1+3%)x3%+123600÷(1+2%)x2% 20600x3%+123600x2% 20600÷(1+3%)x3%+123600÷(1+3%)x2%
(直接费+间接费+利润)x3% 直接费x3% (直接费+间接费)x3% 营业额x3%
x2·x3=x6 (x2)3=x8 x2+x3=x5 x6÷x3=x3
{x|﹣3<x<2} {x|﹣3<x<1} {x|1<x<2} {x|2<x<3}
X1 X2 (Xl,X2) (Xl,X2,X3,X4)