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简便计算:813×17+57×11312÷[(56-13)×3]24×(14+16-13)4
问题详情
参考答案
(1)813×17+57×113,
=813×17+17×513,
=(813+513)×17,
=1×17,
=17;
(2)12÷[(56-13)×3],
=12÷[56×3-13×3],
=12÷[52-1],
=12÷32,
=8;
(3)24×(14+16-13),
=24×14+24×16-24×13,
=6+4-8,
=10-8,
=2;
(4)4.5×7.3+412×2.7,
=4.5×(7.3+2.7),
=4.5×10,
=45;
(5)1-3111÷43×34÷3411,
=1-3411×34×34×1134,
=1-(3411×1134)×(34×34),
=1-1×916,
=1-916,
=716;
(6)(1-130)÷(23-110+16-25),
=(1-130)÷[(23+16)-(110+25)],
=2930÷[56-12],
=2930÷13,
=2910.
考点: