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X1 X2
(Xl,X2) (Xl,X2,X3,X4)
2(2x+1)﹣3(5x﹣3)=1 2x+1﹣5x﹣3=6 2(2x+1)﹣3(5x﹣3)=6 2x+1﹣3(5x﹣3)=6
X1 X2 (X1,X2) (X1,X2,X3,X4)
3x2+2x3=5x5 2x2+3x2=5x2 2x2+3x2=5x4 2x2+3x3=6x5
X1 X2 (X1,X2) (X1,X2,X3,X4)
X1 X2 (X1,X2) (X1,X2,X3,X4)
(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>﹣5x x2≥﹣5x x2<﹣5x x2≤﹣5x
x2·x3=x6 (x2)3=x8 x2+x3=x5 x6÷x3=x3
2x=5x+3 2x=5x﹣3 3x=5x+3 3x=5x﹣3
X1 X2 (Xl,X2) (Xl,X2,X3,X4)