初一数学竞赛题一道(要写过程),如图.
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初一数学竞赛题一道(要写过程),如图.
初一数学竞赛题一道(要写过程),如图.
初一数学竞赛题一道(要写过程),如图.
原式=(x-y)(2x-3y)=30
解集有16组:
(x-y)=1 且2x-3y=30
(x-y)=30 且2x-3y=1
(x-y)=-1 且2x-3y=-30
(x-y)=-30 且2x-3y=-1
(x-y)=2 且2x-3y=15
(x-y)=15 且2x-3y=2
(x-y)=-2 且2x-3y=-15
(x-y)=-15 且2x-3y=-2
(x-y)=6 且2x-3y=5
(x-y)=5 且2x-3y=6
(x-y)=-6且2x-3y=-5
(x-y)=-5 且2x-3y=-6
(x-y)=3 且2x-3y=10
(x-y)=10 且2x-3y=3
(x-y)=-3 且2x-3y=-10
(x-y)=-10 且2x-3y=-3