题目内容
脱式计算
[11.4-(9.1×
+1.2)]÷1
+1÷0.25
4
÷[2
-(
×1
+0.4)]-1.75.
[11.4-(9.1×
6 |
7 |
3 |
5 |
4
1 |
2 |
2 |
5 |
3 |
4 |
1 |
3 |
分析:(1)先算小括号里面的乘法,再算小括号里面的加法,然后算中括号里面的减法,再同时运算括号外的两个除法,最后算加法;
(2)先算小括号里面的乘法,再算小括号里面的加法,然后算中括号里面的减法,再算括号外的除法,最后算括号外的减法.
(2)先算小括号里面的乘法,再算小括号里面的加法,然后算中括号里面的减法,再算括号外的除法,最后算括号外的减法.
解答:解:(1)[11.4-(9.1×
+1.2)]÷1
+1÷0.25,
=[11.4-(7.8+1.2)]÷1
+1÷0.25,
=[11.4-9]÷1
+1÷0.25
=2.4÷1
+1÷0.25,
=1.5+4,
=5.5;
(2)4
÷[2
-(
×1
+0.4)]-1.75,
=4
÷[2
-(1+0.4)]-1.75,
=4
÷[2
-1.4]-1.75,
=4
÷1-1.75,
=4.5-1.75,
=2.75.
6 |
7 |
3 |
5 |
=[11.4-(7.8+1.2)]÷1
3 |
5 |
=[11.4-9]÷1
3 |
5 |
=2.4÷1
3 |
5 |
=1.5+4,
=5.5;
(2)4
1 |
2 |
2 |
5 |
3 |
4 |
1 |
3 |
=4
1 |
2 |
2 |
5 |
=4
1 |
2 |
2 |
5 |
=4
1 |
2 |
=4.5-1.75,
=2.75.
点评:本题考查了四则混合运算,计算步骤较多,要注意计算的顺序和计算法则.
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