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用你喜欢的方法计算(1)(115+217)×15×17(2)(1-1720)×38÷3(3)
问题详情
(1)(
参考答案
(1)(115+217)×15×17,
=(115+217)×(15×17),
=115×15×17+217×15×17,
=17+30,
=47.
(2)(1-1720)×38÷3,
=320×38×13,
=3160;
(3)25×1.25×32
=25×1.25×4×8,
=(25×4)×(1.25×8),
=100×10,
=1000;
(4)175×310+710×175,
=(310+710)×175,
=1×175,
=175;
(5)187.7×11-187.7,
=187.7×(11-1),
=187.7×10,
=1877.
(6)19÷[(34+15)÷12],
=19÷[(1520+420)÷12],
=19÷[1920×2],
=19÷1910,
=19×1019,
=10.
考点:方法