0.1x+0.3y = 0.15(x+y) 0.1x+0.3y+0.2×300 = 0.18×(x+y+300) x=?y=?
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0.1x+0.3y=0.15(x+y)0.1x+0.3y+0.2×300=0.18×(x+y+300)x=?y=?0.1x+0.3y=0.15(x+y)0.1x+0.3y+0.2×300=0.18×(
0.1x+0.3y = 0.15(x+y) 0.1x+0.3y+0.2×300 = 0.18×(x+y+300) x=?y=?
0.1x+0.3y = 0.15(x+y) 0.1x+0.3y+0.2×300 = 0.18×(x+y+300) x=?y=?
0.1x+0.3y = 0.15(x+y) 0.1x+0.3y+0.2×300 = 0.18×(x+y+300) x=?y=?
0.1x+0.3y = 0.15(x+y)(1)
0.1x+0.3y+0.2×300 = 0.18×(x+y+300)(2)
由(1)得 x=3y(3)
由(2)得 -0.08x+0.12y=-6(4)
把(3)代入(4)得 -0.12y=-6
y=50
把y=50代入(3)得 x=150
x=150
y=50
0.1x+0.3y = 0.15(x+y) 0.1x+0.3y+0.2×300 = 0.18×(x+y+300) x=?y=?
0.1x+0.3y = 0.15(x+y) 0.1x+0.3y+0.2×300 = 0.18×(x+y+300) x=?y=?
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