1+-( ) 5+ 24-( )()÷ ÷[×(1-)]5×(+) ()]÷ 4×48×25×
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解:
(1)1+-( ),
=1+--,
=(1-)+(-),
=;
(2),
=+-,
=1-,
=;
(3),
=(+)+(+),
=1+1,
=2;
(4),
=-(+),
=-,
=;
(5)5+,
=(5+)+(+),
=5+1,
=6;
(6)24-(),
=24-,
=22;
(7)()÷,
=÷,
=;
(8)÷[×(1-)],
=÷[×],
=÷,
=6;
(9)5×(+),
=5×+5×,
=+,
=;
(10)()÷,
=÷,
=;
(11)4×48×25×,
=(4×25)×(48×),
=100×8,
=800.
解析分析:(1)根据连减的性质进行简算;
(2)根据加法交换律进行简算;
(3)根据加法交换律和结合律进行简算;
(4)根据连减的性质进行简算;
(5)根据加法交换律和结合律进行简算;
(6)先算加法,再算减法;
(7)先算减法,再算除法;
(8)先算减法,再算乘法,最后算除法;
(9)根据乘法分配律进行计算;
(10)先算加法,再算除法;
(11)根据乘法交换律和结合律进行简算.
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.