4.9×99-4.9
=4.9×（100-1）-4.9
=4.9×100-4.9×1-4.9
=490-4.9-4.9
=480.2
=4.9×（100-1）-4.9
=4.9×100-4.9×1-4.9
=490-4.9-4.9
=480.2
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第1个回答 2017-03-19
4.9×99-4.9
=4.9×(100-1)-4.9
=490-4.9-4.9
=480.2
=4.9×(100-1)-4.9
=490-4.9-4.9
=480.2
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