62×21+6.2×320+620×4.7用简便方法计算?
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62×21+6.2×320+620×4.7
=62×21+62×0.1×320+62×10×4.7
=62×21+62×32+62×47
=62×(21+32+47)
=62×100
=6200
=62×21+62×0.1×320+62×10×4.7
=62×21+62×32+62×47
=62×(21+32+47)
=62×100
=6200
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