题目内容
怎样简便就怎样计算: 3.27+3.27×99 |
13.58-0.91÷1.3×15 |
8.39÷0.125÷0.8 | 1.45×(0.6+1.44÷0.16) |
分析:(1)根据乘法分配律进行简算;
(2)先算除法,再算乘法,最后算减法;
(3)根据除法的性质进行简算;
(4)先算除法,再算加法,最后算乘法.
(2)先算除法,再算乘法,最后算减法;
(3)根据除法的性质进行简算;
(4)先算除法,再算加法,最后算乘法.
解答:解:(1)3.27+3.27×99
=3.27×(1+99)
=3.27×100
=327;
(2)13.58-0.91÷1.3×15
=13.58-0.7×15
=13.58-10.5
=3.08;
(3)8.39÷0.125÷0.8
=8.39÷(0.125×0.8)
=8.39÷0.1
=83.9;
(4)1.45×(0.6+1.44÷0.16)
=1.45×(0.6+9)
=1.45×9.6
=13.92.
=3.27×(1+99)
=3.27×100
=327;
(2)13.58-0.91÷1.3×15
=13.58-0.7×15
=13.58-10.5
=3.08;
(3)8.39÷0.125÷0.8
=8.39÷(0.125×0.8)
=8.39÷0.1
=83.9;
(4)1.45×(0.6+1.44÷0.16)
=1.45×(0.6+9)
=1.45×9.6
=13.92.
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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