脱式计算:×[-(?-0.25)][1.9-1.9×(1.9-1.9)]+1.98×3÷[1÷(3-2.95)].

发布时间:2020-08-12 10:08:58

脱式计算:
×[-(?-0.25)][1.9-1.9×(1.9-1.9)]+1.98×3÷[1÷(3-2.95)].

网友回答

解:×[-(-0.25)]
=×-×(-)
=-×
=-? =;
[1.9-1.9×(1.9-1.9)]+1.9
=[1.9-1.9×0]+1.9
=1.9+1.9
=3.8;
8×3÷[1÷(3-2.95)]
=8×÷[1÷0.25]
=8××
=.
解析分析:利用四则运算顺序与法则解答,能简算的可以简算.

点评:此题考查利用四则混合运算顺序解决问题.
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