一名集邮爱好者有0.8元和0.6元的两种邮票共25张,面值共18.2元,这名集邮爱好者有这两种邮票各多少张?
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要算式
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越细越好!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 展开
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(0.8X25-18.2)/(0.8-0.6)=9.(假设全是0。8元面值的邮票,那么一共是0.8X25=20元。因为有0.6元的面值的所以多出了20-18.2=1.8元,用1.8除以每一枚的差价(0.8-0.6=0.2元),就得到了0.6元面值的枚数:9.所以0.8元的就是25-9=16枚!
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设0.8元的有X张,0.6元的有Y张。
X+Y=25 辅导班的非官方的
0.8X+0.6Y=18.2
X=25—Y 0.8×(25—Y)+0.6Y=18.2
20—0.8Y+0.6Y=18.2
1.8=0.2Y
Y=9
X+Y=25
X=16
0.8元的16张,0.6元的9张
X+Y=25 辅导班的非官方的
0.8X+0.6Y=18.2
X=25—Y 0.8×(25—Y)+0.6Y=18.2
20—0.8Y+0.6Y=18.2
1.8=0.2Y
Y=9
X+Y=25
X=16
0.8元的16张,0.6元的9张
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设0.8元的有X张,0.6元的有Y张。
X+Y=25
0.8X+0.6Y=18.2
X=25—Y 0.8×(25—Y)+0.6Y=18.2
20—0.8Y+0.6Y=18.2
1.8=0.2Y
Y=9
X+Y=25
X=16
0.8元的16张,0.6元的9张。
X+Y=25
0.8X+0.6Y=18.2
X=25—Y 0.8×(25—Y)+0.6Y=18.2
20—0.8Y+0.6Y=18.2
1.8=0.2Y
Y=9
X+Y=25
X=16
0.8元的16张,0.6元的9张。
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