绿色圃中小学教育网
标题:
小学数学趣题巧算百题百讲百练--计算部分练习
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作者:
lspjy
时间:
2008-4-7 13:37
标题:
小学数学趣题巧算百题百讲百练--计算部分练习
15.1×2+2×3+3×4+……+99×100
16.5×6+6×7+7×8+……+19×20
17.1×3+2×4+3×5+……+48×50
18.20×22+21×23+22×24+……+98×100
19.(2+0.38+0.49)×(0.38+0.49+0.5)-(2+ 0.38+0.49+0.5)×(0.38+0.49)
20.(0.123+0.234+0.345)×(0.234+0.345+0.456)-(0.123+0.234+0.345+0.456)×(0.234+0.345)
15.1×2+2×3+3×4+……+99×100
16.5×6+6×7+7×8+……+19×20
17.1×3+2×4+3×5+……+48×50
18.20×22+21×23+22×24+……+98×100
19.(2+0.38+0.49)×(0.38+0.49+0.5)-(2+ 0.38+0.49+0.5)×(0.38+0.49)
20.(0.123+0.234+0.345)×(0.234+0.345+0.456)-(0.123+0.234+0.345+0.456)×(0.234+0.345)
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