计算下面各题(能简便的必须简便计算).420÷[(205-198)×4]9×(16+60)÷1299×4547×15+43×1514×36+14×63+1445×8×25125×32×25(25+20

题目简介

计算下面各题(能简便的必须简便计算).420÷[(205-198)×4]9×(16+60)÷1299×4547×15+43×1514×36+14×63+1445×8×25125×32×25(25+20

题目详情

计算下面各题(能简便的必须简便计算).
420÷[(205-198)×4]
9×(16+60)÷1299×45
47×15+43×1514×36+14×63+1445×8×25
125×32×25(25+20)×4.
题型:解答题难度:中档来源:不详

答案

(1)420÷[(205-198)×4],
=420÷[7×4],
=420÷28,
=15;

(2)9×(16+60)÷12,
=9×76÷12,
=684÷12,
=57;

(3)99×45,
=(100-1)×45,
=100×45-45×1,
=4500-45,
=4455;

(4)47×15+43×15,
=(47+43)×15,
=90×15,
=1350;

(5)14×36+14×63+14,
=14×(36+63+1),
=14×100,
=1400;

(6)45×8×25,
=45×2×4×25,
=(45×2)×(4×25),
=90×100,
=9000;

(7)125×32×25,
=125×8×4×25,
=(125×8)×(4×25),
=1000×100,
=100000;

(8)(25+20)×4,
=25×4+20×4,
=100+80,
=180.

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