如题所述
2.9*101
=2.9*（100+1）
=2.9*100+2.9*1
=290+2.9
=292.9
=2.9*（100+1）
=2.9*100+2.9*1
=290+2.9
=292.9
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第1个回答 2016-11-10
2.9乘101
=2.9x(100+1)
=2.9x100+2.9
=290+2.9
=292.9
=2.9x(100+1)
=2.9x100+2.9
=290+2.9
=292.9
第2个回答 2016-11-10
2.9×101
=2.9×（100+1）
=2.9×100+2.9×1
=290+2.9
=292.9
=2.9×（100+1）
=2.9×100+2.9×1
=290+2.9
=292.9
