x1+x3+x4=7 x2+x3+x4=6 x2+x1+x4=8 x2+x1+x3=9 求x1 x2 x3 x4 是多少
2个回答
x1+x2+x3+x4=(7+6+8+9)÷3=10
x1=4,x2=3,x3=2,x4=1.
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