(0.98*99+0.98)/49 用简便方法做

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(0.98*99+0.98)/49 用简便方法做
(0.98*99+0.98)/49 用简便方法做

(0.98*99+0.98)/49 用简便方法做
(0.98*99+0.98)/49
=((1-0.02)*(100-1) + 0.98)/49
=(100 - 2 -1 + 0.02 + 0.98)/49
= (97 + (0.02 + 0.98))/49
=(97 + 1)/49
=98/49
=2