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2÷[(-)×9]×61.25×67.875+0.125×6787.5+125×0.53375.

编辑:chaxungu时间:2026-04-27 07:15:13分类:小学数学题库

2÷[(数学公式-数学公式)×9]×6
1.25×67.875+0.125×6787.5+125×0.53375.解:(1)2÷[(-)×9]×6,
=2÷[×9-×9]×6,
=2÷[-]×6,
=2÷×6,
=2×12×6,
=144;

(2)1.25×67.875+0.125×6787.5+125×0.53375,
=125×0.67875+125×6.7875+125×0.53375,
=125×(0.67875+6.7875+0.53375),
=125×8,
=1000.
分析:(1)中括号内运用乘法分配律简算,然后再算括号外的除法和乘法;
(2)根据数字特点,原式变为125×0.67875+125×6.7875+125×0.53375,运用乘法分配律简算.
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.