(口算)4+6+8+10+12+14+16+18+20+22+24+26+28+30+32+34+36.
人气:392 ℃ 时间:2020-05-11 00:44:14
解答
4+6+8+10+12+14+16+18+20+22+24+26+28+30+32+34+36
=(4+36)×17÷2
=40×17÷2
=340
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