果园一共有212棵树,苹果树与桃树的比是5:3,桃树比梨树少七分之三,三种树各
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已知:苹果树+桃树+梨树=212,
苹果树:桃树=5:3,苹果树=5/3桃树
梨树=桃树+3/7,
将苹果树和梨树代入上式得:
5/3桃树+桃树+桃树+3/7=212,
11/3桃树=212-3/7=(212x7-3)/7,
桃树=(1484-3)x3/(7x11)
=1481x3/77
=4443/77
=57又54/77
苹果树=5/3桃树=5/3x4443/77
=5x1481/77
=7405/77
=96又3/77
梨树=桃树+3/7=4443/77+3/7
=(4443+3x11)/77
=4476/77
=58又10/77
苹果树:桃树=5:3,苹果树=5/3桃树
梨树=桃树+3/7,
将苹果树和梨树代入上式得:
5/3桃树+桃树+桃树+3/7=212,
11/3桃树=212-3/7=(212x7-3)/7,
桃树=(1484-3)x3/(7x11)
=1481x3/77
=4443/77
=57又54/77
苹果树=5/3桃树=5/3x4443/77
=5x1481/77
=7405/77
=96又3/77
梨树=桃树+3/7=4443/77+3/7
=(4443+3x11)/77
=4476/77
=58又10/77
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