50+30+200+240
25+30+35+40+45=______×______200+220+240+260+280+300+320=______×______....
25+30+35+40+45=______×______
200+220+240+260+280+300+320=______×______. 展开
200+220+240+260+280+300+320=______×______. 展开
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