如题所述
a + b = 1000 - 199 = 801
b + c = 1000 - 304 = 696
a + c = 1000 - 381 = 619
a + b + c = (801 + 696 + 619) / 2 = 1058
a = 1058 - 696 = 362
b = 1058 - 619 = 439
c = 1058 - 801 = 257
不对
谢谢,很详细。上面那个速度快一些。谢谢!
( )+199+( )=( )+304+( )=( )+381+( )=1000
用方程组解