题目内容
脱式计算.
124-35÷7 | (34+22)÷8 | 45÷(15÷3) |
105+6×8 | 62-(16-9) | 24×3+72. |
分析:(1)先算除法,再算减法,
(2)先算小括号里的加法,再算括号外的除法,
(3)先算小括号里的除法,再算括号外的除法,
(4)先算乘法,再算加法,
(5)先算小括号里的减法,再算括号外的减法,
(6)先算乘法,再算加法.
(2)先算小括号里的加法,再算括号外的除法,
(3)先算小括号里的除法,再算括号外的除法,
(4)先算乘法,再算加法,
(5)先算小括号里的减法,再算括号外的减法,
(6)先算乘法,再算加法.
解答:解:(1)124-35÷7,
=124-5,
=119;
(2)(34+22)÷8,
=56÷8,
=7;
(3)45÷(15÷3),
=45÷5,
=9;
(4)105+6×8,
=105+48,
=153;
(5)62-(16-9),
=62-7,
=55;
(6)24×3+72,
=72+72,
=144.
=124-5,
=119;
(2)(34+22)÷8,
=56÷8,
=7;
(3)45÷(15÷3),
=45÷5,
=9;
(4)105+6×8,
=105+48,
=153;
(5)62-(16-9),
=62-7,
=55;
(6)24×3+72,
=72+72,
=144.
点评:此题考查了整数四则混合运算的顺序,有括号的要先算括号里的运算.
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