题目内容

2÷[(
1
27
-
1
36
)×9]×6
1.25×67.875+0.125×6787.5+125×0.53375.
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.
解答:解:(1)2÷[(
1
27
-
1
36
)×9]×6,
=2÷[
1
27
×9-
1
36
×9]×6,
=2÷[
1
3
-
1
4
]×6,
=2÷
1
12
×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.
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.
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