用递等式计算.(能简算的要简算)
(1)(32×106-352)÷38
(2)
(3)
(4)
(5)
(6).
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解:
(1)(32×106-352)÷38,
=(3392-352)÷38,
=3040÷38,
=80;
(2),
=()×,
=1×,
=;
(3),
=×,
=;
(4),
=×-,
=-,
=;
(5),
=(4+5)+(5.375+2),
=10+8,
=18;
(6),
=7.8÷[32×+3.6],
=7.8÷[12+3.6],
=7.8÷15.6,
=0.5.
解析分析:(1)先算乘法,再算减法,最后算除法;
(2)根据乘法分配律进行计算;
(3)先算减法和加法,再算乘法;
(4)先算加法,再算乘法,最后算减法;
(5)根据加法交换律和结合律进行计算;
(6)先算减法,再算乘法,再算加法,最后算除法.
点评:此题主要考查整数、分数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.