题目内容
能简算的要简算.
×÷ | ÷( +) | ×7+×11 | (-)×36 |
×99+ | . |
解:(1)×÷,
=××,
=×,
=1;
(2)÷( +),
=÷,
=;
(3)×7+×11,
=×(7+11),
=×18,
=10;
(4)(-)×36,
=×36-×36,
=21-10,
=11;
(5)[1-(+)]÷,
=(1-)÷,
=×4,
=;
(6)×99+,
=×(99+1),
=×100,
=16;
(7),
=×+×,
=(+)×,
=1×,
=.
分析:(1)按照从左到右的顺序计算;
(2)先算小括号里面的加法,再算括号外的除法;
(3)(4)(6)运用乘法分配律简算;
(5)先算小括号里面的加法,再算中括号里面的减法,最后算括号外的除法;
(7)先把除法变成乘法,再运用乘法分配律简算.
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.
=××,
=×,
=1;
(2)÷( +),
=÷,
=;
(3)×7+×11,
=×(7+11),
=×18,
=10;
(4)(-)×36,
=×36-×36,
=21-10,
=11;
(5)[1-(+)]÷,
=(1-)÷,
=×4,
=;
(6)×99+,
=×(99+1),
=×100,
=16;
(7),
=×+×,
=(+)×,
=1×,
=.
分析:(1)按照从左到右的顺序计算;
(2)先算小括号里面的加法,再算括号外的除法;
(3)(4)(6)运用乘法分配律简算;
(5)先算小括号里面的加法,再算中括号里面的减法,最后算括号外的除法;
(7)先把除法变成乘法,再运用乘法分配律简算.
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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