题目内容

脱式计算.
37×64+37×136
246÷6×135-2645
(127+47)×15÷5
(550-400)÷5×247.

解:(1)37×64+37×136,
=37×(64+136),
=37×200,
=7400;

(2)246÷6×135-2645,
=41×135-2645,
=5535-2645,
=2890;

(3)(127+47)×15÷5,
=174×15÷5,
=2610÷5,
=522;

(4)(550-400)÷5×247,
=150÷5×247,
=30×247,
=7410.
分析:(1)运用乘法分配律简算;
(2)先算除法,再算乘法,最后算减法;
(3)先算小括号里面的乘法,再算括号外的乘法,最后算除法;
(4)先算小括号里面的减法,再算括号外的除法,最后算乘法.
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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