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If 500 is the multiply of 100 that is closest to x and 400 is the multiply of 100 that is closest to y,which multiply 100 is closest to x+y?

(1)x<500

(2)y<400

答案是E

这题要怎么理解???

代入吧

X乘以100 离500近  450到549

Y乘以100 离400近  350到449

X+Y   800到900多

有8和9两个，所以选E

个人意见，仅供参考