a已知a+b=8,a²-b²=48,287a+3b=

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/23 19:54:49
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