二年级下册万以内加减法口算.docx

520＋490＝ 620－570＝ 1170－280＝
470＋580＝ 720－590＝ 580＋230＝
598＋204＝ 357＋448＝ 250＋381≈ 552＋749≈
580+250-470 650+590-580
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950－570+570 450－360+250
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224－130+640 350－180+647
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370＋160-280 350－160-190
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762-314+218 700-557+344
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503-239+247 712-536+524
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460+280-350 630+290-470
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980－570+490 450－360+580
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294－130+270 350－180+480
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370＋160-250 240－160+550
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666-354+254 700-538+256
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543-239+548 728-536+265
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580+250-470 650+590-580