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2+4+6+8+10+12+14+16+18=______×______.
人气:264 ℃ 时间:2020-04-20 18:40:20
解答
2+4+6+8+10+12+14+16+18,
=(2+18)×9÷2,
=20×9÷2,
=10×9.
故答案为:10,9.
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