问题 计算题
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+43×15
14×36+14×63+1445×8×25125×32×25(25+20)×4
答案

解:(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

单项选择题
单项选择题