a已知a+b=8,a²-b²=48,287a+3b=
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a已知a+b=8,a²-b²=48,287a+3b=a已知a+b=8,a²-b²=48,287a+3b=a已知a+b=8,a²-b²=48,
a已知a+b=8,a²-b²=48,287a+3b=
a已知a+b=8,a²-b²=48,287a+3b=
a已知a+b=8,a²-b²=48,287a+3b=
(a+b)=8
(a+b)(a-b)=48
a-b=6
a=7
b=1
287a+3b=287*7+3=2012
a²-b²=(a+b)(a-b)
所以a-b=48÷8=6
解得a=7b=1
所以287a+3b=2012