题目内容

4×7+8×9        32÷8+40÷5           125×8-25×4
85×6-1771÷7         3248÷8+53×9         (886+1741)÷8.
分析:(1)先算乘法,再算加法;
(2)先算除法,再算加法;
(3)先算乘法,再算减法;
(4)先算乘法、除法,再算减法;
(5)先算除法、乘法,再算加法;
(6)先算小括号内的加法,再算括号外面的除法.
解答:解:(1)4×7+8×9,
=28+72,
=100;

(2)32÷8+40÷5,
=4+8,
=12;

(3)125×8-25×4,
=1000-100,
=900;

(4)85×6-1771÷7,
=510-253,
=257;

(5)3248÷8+53×9,
=406+477,
=883;

(6)(886+1741)÷8,
=2627÷8,
=328.375.
点评:此题考查了整数四则混合运算的运算顺序,即:先算乘除后算加减,有括号的先算括号里面的.
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