问题
解答题
脱式计算 [11.4-(9.1×
4
|
答案
(1)[11.4-(9.1×
+1.2)]÷16 7
+1÷0.25,3 5
=[11.4-(7.8+1.2)]÷1
+1÷0.25,3 5
=[11.4-9]÷1
+1÷0.25 3 5
=2.4÷1
+1÷0.25,3 5
=1.5+4,
=5.5;
(2)4
÷[21 2
-(2 5
×13 4
+0.4)]-1.75,1 3
=4
÷[21 2
-(1+0.4)]-1.75,2 5
=4
÷[21 2
-1.4]-1.75,2 5
=4
÷1-1.75,1 2
=4.5-1.75,
=2.75.