解题思路:(1)125×64-24×64-64,运用乘法分配律进行简算;
(2)19+21+23+…+49+51,运用加法交换律和结合律进行简算;
(3)(25+19)×4,运用乘法分配律进行简算;
(4)99999×26+33333×22,根据积的变化规律转化为:33333×78+33333×22,运用乘法分配律进行简算;
(5)25×125×32,运用乘法分配律进行简算;
(6)102×88运用乘法分配律进行简算;
(7)9000÷25÷4,根据除法的运算性质进行简算;
(8)99×46.运用乘法分配律进行简算.
(1)125×64-24×64-64,
=(125-24-1)×64,
=100×64,
=6400;
(2)19+21+23+…+49+51,
=(19+51)+(21+49)+…(33+37)+35,
=70×8+35,
=560+35,
=595;
(3)(25+19)×4,
=25×4+19×4,
=100+76,
=176;
(4)99999×26+33333×22,
=33333×78+33333×22,
=33333×(78+22),
=33333×100,
=3333300;
(5)25×125×32,
=(25×4)×(125×8),
=100×1000,
=100000;
(6)102×88,
=100×88+2×88,
=8800+176,
=8976;
(7)9000÷25÷4,
=9000÷(25×4),
=9000÷100,
=90;
(8)99×46.
=100×46-46,
=4600-46,
=4554.
点评:
本题考点: 运算定律与简便运算.
考点点评: 此题考查的目的是使学生运用加法、乘法的运算定律和运算性质进行简便计算.