题目内容

计算下面各题,能简便的就简便.
5.5×17.3+6.7×5.5        1.5×105                9.18-9.18÷2.7
9.07-22.78÷3.4          3.8+4.29+2.1+4.2        3.56+6.44÷2.3
分析:(1)根据乘法分配律进行简算;
(2)105=100+5,然后再根据乘法分配律进行简算;
(3)先算除法,再算减法;
(4)先算除法,再算减法;
(5)根据加法交换律和结合律进行简算.
(6)先算除法,再算加法.
解答:解:(1)5.5×17.3+6.7×5.5
=5.5×(17.3+6.7)
=5.5×24
=132;

(2)1.5×105
=1.5×(100+5)
=1.5×100+1.5×5
=150+7.5
=157.5;

(3)9.18-9.18÷2.7
=9.18-3.4
=5.78;

(4)9.07-22.78÷3.4
=9.07-6.7
=2.37;

(5)3.8+4.29+2.1+4.2
=(3.8+4.2)+(4.29+2.1)
=8+6.39
=14.39;

(6)3.56+6.44÷2.3
=3.56+2.8
=6.36.
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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