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估算698×52≈804×29≈581×98≈297×89≈402×21≈291×19≈
题目详情
估算
698×52≈ | 804×29≈ | 581×98≈ | 297×89≈ | 402×21≈ | 291×19≈ |
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答案和解析
(1)698×52,
≈700×50,
=35000;
(2)804×29,
≈800×30,
=24000;
(3)581×98,
≈600×100,
=60000;
(4)297×89,
≈300×100,
=30000;
(5)402×21,
≈400×20,
=80000;
(6)291×19,
≈300×20,
=60000.
≈700×50,
=35000;
(2)804×29,
≈800×30,
=24000;
(3)581×98,
≈600×100,
=60000;
(4)297×89,
≈300×100,
=30000;
(5)402×21,
≈400×20,
=80000;
(6)291×19,
≈300×20,
=60000.
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