简便计算.45×19853×49+5345×20125×61-25134×56-134+134×45125×32×25256×7-8×49540×51÷17234×124000+766000×1241

题目简介

简便计算.45×19853×49+5345×20125×61-25134×56-134+134×45125×32×25256×7-8×49540×51÷17234×124000+766000×1241

题目详情

简便计算.
45×198
53×49+5345×201
25×61-25134×56-134+134×45125×32×25
256×7-8×49540×51÷17234×124000+766000×124
1999+999×9999×17+91÷17-5×17+45÷17
11…11
10个1
×
99…99
10个9
题型:解答题难度:中档来源:不详

答案

(1)45×198,
=45×(200-2),
=45×200-45×2,
=9000-90,
=8910;

(2)53×49+53,
=53×(49+1),
=53×50,
=2650;

(3)45×201,
=45×(200+1),
=45×200+45×1,
=9000+45,
=9045;

(4)25×61-25,
=25×(61-1),
=25×60,
=1500;

(5)134×56-134+134×45,
=134×(56-1+45),
=134×100,
=13400;

(6)125×32×25,
=125×8×4×25,
=(125×8)×(4×25),
=1000×100,
=100000;

(7)256×7-8×49,
=256×7-7×56,
=(256-56)×7,
=200×7,
=1400;

(8)540×51÷17,
=540×(51÷17),
=540×3,
=1620;

(9)234×124000+766000×124,
=234000×124+766000×124,
=(234000+766000)×124,
=1000000×124,
=124000000;

(10)1999+999×999,
=1000+999×1+999×999,
=1000+(1+999)×999,
=1000+1000×999,
=1000×(999+1),
=1000000.

(11)9×17+91÷17-5×17+45÷17,
=9×17-5×17+91÷17+45÷17,
=(9-5)×17+(91+45)÷17,
=4×17+136÷17,
=68+8,
=76;

(12)由11×99=1089,
111×999=110889,
1111×9999=11108889,
可知:
11…11
10个1
×
99…99
10个9
=1111111110888888889.
故答案为:8910,2650,9045,1500,13400,100000,1400,1620,124000000,1000000,76,1111111110888888889.

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