题目内容
递等式计算(能简便计算的要简便):
(1)5787-329-1071
(2)52×11+11×18
(3)72÷2×5
(4)65+65÷5
(5)912-512+88.
(1)5787-329-1071
(2)52×11+11×18
(3)72÷2×5
(4)65+65÷5
(5)912-512+88.
分析:(1)根据减法的性质简算;
(2)运用乘法分配律简算;
(3)(5)按照从左到右的顺序计算;
(4)先算除法,再算加法.
(2)运用乘法分配律简算;
(3)(5)按照从左到右的顺序计算;
(4)先算除法,再算加法.
解答:解:(1)5787-329-1071,
=5787-(329+1071),
=5787-1400,
=4387;
(2)52×11+11×18,
=(52+18)×11,
=70×11,
=770;
(3)72÷2×5,
=36×5,
=180;
(4)65+65÷5,
=65+13,
=78;
(5)912-512+88,
=400+88,
=488.
=5787-(329+1071),
=5787-1400,
=4387;
(2)52×11+11×18,
=(52+18)×11,
=70×11,
=770;
(3)72÷2×5,
=36×5,
=180;
(4)65+65÷5,
=65+13,
=78;
(5)912-512+88,
=400+88,
=488.
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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