题目内容
计算下列各题.(能简算的要简算)
. |
解:
(1),
=,
=,
=×1,
=;
(2),
=0.5×3.2+5.6×0.5+1.2×0.5,
=0.5×(3.2+5.6+1.2),
=0.5×10,
=5;
(3),
=,
=510÷[35-18],
=510÷17,
=30;
(4),
=+÷,
=+,
=.
分析:(1)根据乘法分配律进行计算;
(2)根据乘法分配律进行计算;
(3)中括号里面的根据乘法分配律进行计算.再算除法;
(4)先算减法,再算除法,最后算加法.
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律简便计算.
(1),
=,
=,
=×1,
=;
(2),
=0.5×3.2+5.6×0.5+1.2×0.5,
=0.5×(3.2+5.6+1.2),
=0.5×10,
=5;
(3),
=,
=510÷[35-18],
=510÷17,
=30;
(4),
=+÷,
=+,
=.
分析:(1)根据乘法分配律进行计算;
(2)根据乘法分配律进行计算;
(3)中括号里面的根据乘法分配律进行计算.再算除法;
(4)先算减法,再算除法,最后算加法.
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律简便计算.
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