(1)1025-4050÷54???????????????????
(2)(100-19)÷(1.63+1.07)
(3)5-÷×??????
(4)4.3÷(3.4-1.25)×0.4]
(5)÷[(-)×].
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解:(1)1025-4050÷54
=1025-75
=950;
(2)(100-19)÷(1.63+1.07)
=81÷2.7
=30;
(3)5-÷×
=5-××
=5-×
=5-
=4;
(4)4.3÷[(3.4-1.25)×0.4]
=4.3÷[2.15×0.4]
=4.3÷0.86
=5;
(5)÷[(-)×].
=÷[×].
=÷
=1.
解析分析:按四则混合运算的顺序运算解答即可.
点评:解答时一定按运算顺序解答.