问题
解答题
口算: 19+19+19+19+19+19+19+19+19+19=______
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答案
19+19+19+19+19+19+19+19+19+19=19×10=190;
=55×100=5500.55+55+55+…+55 100
故答案为:190;55,100,5500.
口算: 19+19+19+19+19+19+19+19+19+19=______
|
19+19+19+19+19+19+19+19+19+19=19×10=190;
=55×100=5500.55+55+55+…+55 100
故答案为:190;55,100,5500.