题目内容
脱式计算,能用简便方法计算的用简便方法计算.
(1)32×125×2.5 (2)94÷(6.84×8.5-31.46÷0.55)
(1)32×125×2.5 (2)94÷(6.84×8.5-31.46÷0.55)
分析:(1)32×125×2.5,把32拆成4×8,然后用乘法分配律的逆运算简算;
(2)此题不能简算,按运算顺序进行计算.
(2)此题不能简算,按运算顺序进行计算.
解答:解:(1)32×125×2.5,
=4×8×125×2.5,
=8×125×(4×2.5),
=1000×10,
=10000;
(2)94÷(6.84×8.5-31.46÷0.55),
=94÷(58.14-57.2),
=94÷0.94,
=100.
=4×8×125×2.5,
=8×125×(4×2.5),
=1000×10,
=10000;
(2)94÷(6.84×8.5-31.46÷0.55),
=94÷(58.14-57.2),
=94÷0.94,
=100.
点评:主要考查整数、小数四则混合运算法则的正确运用,注意运算的顺序与括号.
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