21.5×1.9+2.15×81怎样简算

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21.5×1.9+2.15×81怎样简算21.5×1.9+2.15×81怎样简算21.5×1.9+2.15×81怎样简算原式=(2.15×10)×1.9+2.15×81=2.15×(10×1.9)+2

21.5×1.9+2.15×81怎样简算
21.5×1.9+2.15×81怎样简算

21.5×1.9+2.15×81怎样简算
原式=(2.15×10)×1.9+2.15×81
=2.15×(10×1.9)+2.15×81
=2.15×19+2.15×81
=2.15×(19+81)
=2.15×100
=215