问题 解答题
估算下面各题.
505×37≈
496×11≈203×25≈
191×69≈621×43≈901×21≈
答案

505×37≈20000,496×11≈5000,203×25≈5000,
191×69≈14000,621×43≈24000,901×21≈18000.

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