a1+a2=40 a3+a4=160 a5+a6=?
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a1+a2=40 a3+a4=160 a5+a6=?
![a1+a2=40 a3+a4=160 a5+a6=?](/uploads/image/z/18623231-71-1.jpg?t=a1%2Ba2%3D40+a3%2Ba4%3D160+a5%2Ba6%3D%3F)
2a3=a1+a5 2a4=a2+a6 2(a3+a4)=a1+a2+a5+a6 a5+a6=2(a3+a4)-(a1+a2)=2x160-40=280 希望对你有用,
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