脱式计算
1.5×[0.02÷(2.1-2.09)]
÷[()]
64×
6.
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解:
(1)1.5×[0.02÷(2.1-2.09)],
=1.5×[0.02÷0.01],
=1.5×2,
=3;
(2)÷[()],
=÷[-],
=÷[--],
=÷[1-],
=÷,
=;
(3)64×,
=(63+1)×,
=63×+1×,
=5+,
=5;
(4)6,
=10-,
=9.9.
解析分析:(1)先算减法,再算除法,最后算乘法;
(2)先根据连减的性质计算中括号里面的,最后算除法;
(3)根据乘法分配律进行计算;
(4)先算除法,再算减法.
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.