题目内容
14×70-624÷6 | 32×0.125×2.5 | |
. |
解:(1)14×70-624÷6,
=980-104,
=876;
(2)32×0.125×2.5,
=4×8×0.125×2.5,
=8×0.125×(4×2.5),
=1×10,
=10;
(3)--,
=-(+),
=-2,
=;
(4)÷9+×,
=×+×,
=(+)×,
=×,
=;
(5)(+×)÷,
=(+)×,
=×,
=1;
(6)÷[-(1-)],
=÷[-],
=÷,
=×10,
=.
分析:(1)先算乘除,再算减法;
(2)把32看作4×8,运用乘法交换律与结合律简算;
(3)运用减法的性质简算;
(4)把除法改为乘法,运用乘法分配律简算;
(5)先算括号内的乘法,再算括号内的加法,最后算括号外的除法;
(6)先算小括号内的,再算中括号内的,最后算括号外的.
点评:此题主要考查分数、整数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
=980-104,
=876;
(2)32×0.125×2.5,
=4×8×0.125×2.5,
=8×0.125×(4×2.5),
=1×10,
=10;
(3)--,
=-(+),
=-2,
=;
(4)÷9+×,
=×+×,
=(+)×,
=×,
=;
(5)(+×)÷,
=(+)×,
=×,
=1;
(6)÷[-(1-)],
=÷[-],
=÷,
=×10,
=.
分析:(1)先算乘除,再算减法;
(2)把32看作4×8,运用乘法交换律与结合律简算;
(3)运用减法的性质简算;
(4)把除法改为乘法,运用乘法分配律简算;
(5)先算括号内的乘法,再算括号内的加法,最后算括号外的除法;
(6)先算小括号内的,再算中括号内的,最后算括号外的.
点评:此题主要考查分数、整数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
练习册系列答案
相关题目