213-135÷9
26×4-112÷8
68×19+32×19
34×25×40
632-89-232
(56+21)×(96÷8).
解:(1)213-135÷9,
=213-15,
=198;
(2)26×4-112÷8,
=104-14,
=90;
(3)68×19+32×19,
=(68+32)×19,
=100×19,
=1900;
(4)34×25×40,
=34×(25×40),
=34×1000,
=34000;
(5)632-89-232,
=632-232-89,
=400-89,
=311;
(6)(56+21)×(96÷8),
=77×12,
=924.
分析:(1)先算除法,再算减法;
(2)先同时运算乘法和除法,再算减法;
(3)运用乘法分配律简算;
(4)运用乘法结合律简算;
(5)运用加法交换律简算;
(6)先同时运算两个小括号里面的加法和除法,最后算括号外的乘法.
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.