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计算:(能简算的要简算)①13×34÷(34-512)②99×9798③(329+227)×29×27④35×47+35×37.

题目详情
计算:(能简算的要简算)
1
3
×
3
4
÷(
3
4
-
5
12
)                    
②99×
97
98

③(
3
29
+
2
27
)×29×27                  
3
5
×
4
7
+
3
5
×
3
7
▼优质解答
答案和解析
(1)
1
3
×
3
4
÷(
3
4
-
5
12

=
1
3
×
3
4
÷
1
3

=
1
4
÷
1
3

=
3
4


(2)99×
97
98

=98×
97
98
+1×
97
98

=97+
97
98

=97
97
98


(3)(
3
29
+
2
27
)×29×27    
=
3
29
×29×27+
2
27
×29×27          
=81+58
=139;
        
(4)
3
5
×
4
7
+
3
5
×
3
7

=
3
5
×(
4
7
+
3
7

=
3
5
×1
=
3
5