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脱式计算38÷[(15+14)×38]35-45×16÷35720÷〔711×(5-43)〕
问题详情
脱式计算
(
76.9÷[1÷(3.1-3.09)]
(0.72+6.58÷0.7)×0.5.
参考答案
(1)38÷[(15+14)×38]
=38÷[920×38]
=38×16027
=209;
(2)35-45×16÷35
=35-215÷35
=35-29
=1745;
(3)720÷[711×(5-43)]
=720÷[711×113]
=720×37
=320;
(4)(12+13)÷58-13
=56×85-13
=43-13
=1;
(5)76.9÷[1÷(3.1-3.09)]
=76.9÷[1÷0.01]
=76.9÷100
=0.769;
(6)(0.72+6.58÷0.7)×0.5
=(0.72+9.4)×0.5
=10.12×0.5
=5.06.
考点: