Question

62×21+6.2×320+620×4.7用简便方法计算？

Answer 1

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

Answer 2

62x2l十6.2x320十620x4.7＝62x21十62x32十62x47＝62x（21十32十47）＝62x100＝6200。