解题思路:(1)(2)利用交换律与减法的性质简算;
(3)利用减法的性质简算;
(4)把299=300-1计算;
(5)(11)利用除法的性质简算;
(6)(10)(12)利用乘法分配律简算;
(7)先算乘法,再算减法,最后算加法;
(8)先算括号里面的除法,再算减法,最后算括号外面的除法;
(9)先算乘法和除法,再算减法.
(1)368-128+32-72
=368+32-(72+128)
=400-200
=200;
(2)2096-884-116-996
=2096-996-(884+116)
=1100-1000
=100;
(3)1998-(998-376)
=1998-998+376
=1000+376
=1376;
(4)345+299
=345+300-1
=645-1
=644;
(5)600÷24
=600÷6÷4
=100÷4
=25;
(6)44×99
=44×100-44×1
=4400-44
=4356;
(7)3562-15×209+188
=3562-3135+188
=645;
(8)3737÷(67-720÷24)
=3737÷(67-30)
=3737÷37
=101;
(9)16×28-240÷15
=448-16
=432;
(10)36×102-36×2
=36×(102-2)
=36×100
=3600;
(11)1300÷25÷4
=1300÷(25×4)
=1300÷100
=13;
(12)11×78+11×23-11
=11×(78+23-1)
=11×100
=1100.
点评:
本题考点: 整数四则混合运算.
考点点评: 整数混合运算的关键是抓住运算顺序,正确按运算顺序计算,适当利用运算定律简算.