兔子数目=(248-100*2)/2=24只,鸡的数目=100-24=76只
设鸡X只,兔100-X只2X+4(100-X)=2482X+400-4X=2482X=152X=76鸡76只,兔24只
248-200=4848÷2=24100-24=76所以:鸡76只,兔24只
100×4-248=152只鸡:152÷(4-2)=76只兔:100-76=24只
设鸡X只,兔100-x只解:2x+4(