计算下列各题,能简算的要简算.
1+0.45+0.9-
98×6.25×1.25-12.5×0.625×18.
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解:(1)1+0.45+0.9-,
=1+0.45+0.9-0.875,
=1.475;
(2),
=,
=5-3.75,
=1.25;
(3)98×6.25×1.25-12.5×0.625×18,
=98×6.25×1.25-1.25×10×0.625×18,
=98×6.25×1.25-1.25×6.25×18,
=(98-18)×6.25×1.25,
=80×6.25×1.25,
=625.
解析分析:(1)根据四则混合运算的顺序进行计算;
(2)一个数减去两个数的和,等于分别减去这两个数;
(3)根据乘法分配律来进行计算.
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.