题目内容
列递等式计算,能简算的要简算. 9470-104×65 | 4.49+4.84+4.51+4.16 | 88×() |
[()] | ÷. |
解:(1)9470-104×65,
=9470-6760,
=2710;
(2)4.49+4.84+4.51+4.16,
=(4.49+4.51)+(4.84+4.16),
=9+9,
=18;
(3)88×(),
=88××88,
=40-22,
=18;
(4)[()],
=[+-],
=[1-]×4,
=×4,
=1;
(5)[-(-)]÷,
=[-]÷,
=×,
=;
(6)÷,
=÷[×],
=÷,
=×,
=.
分析:(1)先算乘法,再算减法;
(2)运用加法交换律与结合律简算;
(3)运用乘法分配律简算;
(4)(5)(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.
=9470-6760,
=2710;
(2)4.49+4.84+4.51+4.16,
=(4.49+4.51)+(4.84+4.16),
=9+9,
=18;
(3)88×(),
=88××88,
=40-22,
=18;
(4)[()],
=[+-],
=[1-]×4,
=×4,
=1;
(5)[-(-)]÷,
=[-]÷,
=×,
=;
(6)÷,
=÷[×],
=÷,
=×,
=.
分析:(1)先算乘法,再算减法;
(2)运用加法交换律与结合律简算;
(3)运用乘法分配律简算;
(4)(5)(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.
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