题目内容
12.计算下面各题,能简算的要简算40+360÷40-20 | (87-25)×12÷6 | 25×33×4 |
(372+148)÷(103-90) | 125×88 | 4200÷25÷4 |
234-66-34 | 482×53+482×47 | 95×101 |
分析 (1)先算除法,再算加法,最后算减法;
(2)先算减法,再算乘法,最后算除法;
(3)根据乘法交换律进行简算;
(4)先算加法和减法,再算除法;
(5)根据乘法结合律进行简算;
(6)根据除法的性质进行简算;
(7)根据减法的性质进行简算;
(8)、(9)根据乘法分配律进行简算.
解答 解:(1)40+360÷40-20
=40+9-20
=49-20
=29;
(2)(87-25)×12÷6
=62×12÷6
=744÷6
=124;
(3)25×33×4
=25×4×33
=100×33
=3300;
(4)(372+148)÷(103-90)
=520÷13
=40;
(5)125×88
=125×(8×11)
=(125×8)×11
=1000×11
=11000;
(6)4200÷25÷4
=4200÷(25×4)
=4200÷100
=42;
(7)234-66-34
=234-(66+34)
=234-100
=134;
(8)482×53+482×47
=482×(53+47)
=482×100
=48200;
(9)95×101
=95×(100+1)
=95×100+95×1
=9500+95
=9595.
点评 考查了运算定律与简便运算,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简便计算.
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