计算下面各题,能用简便方法算的就用简便方法算.
(1)450+450÷18
(2)(0.64÷16+1.06)÷22(3)(4)
网友回答
解:(1)450+450÷18,
=450+25,
=475;
(2)(0.64÷16+1.06)÷22,
=(0.04+1.06)÷22,
=1.1÷22,
=0.05;
(3)÷[×(+)],
=÷[×],
=÷,
=×,
=;
(4)×+×25%+1÷4,
=×0.25+×0.25+0.25,
=0.25×(++1),
=0.25×2,
=0.5.
解析分析:(1)先算出,再算加;(2)先算小括号里的除,再算加,最后算括号外面的除;(3)按四则运算的顺序计算;(4)把,25%,1÷4,都看成0.25,利用乘法的分配律计算简便.
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.