问题
解答题
怎样算简便就怎样算. ①9+8÷26+27÷39 ②0.8×[13-(3.12+5.28)] ③
④
|
答案
①9+8÷26+27÷39,
=9+
+8 26
,27 39
=9+
+4 13
,9 13
=9+(
+4 13
),9 13
=10;
②0.8×[13-(3.12+5.28)],
=0.8×[13-8.4],
=0.8×4.6,
=3.68;
③
÷[4 9
-(4 5
-1 3
)],1 5
=
÷[4 9
+4 5
-1 5
],1 3
=
÷4 9
,2 3
=
×4 9
,3 2
=
;2 3
④
+(6 17
+13 14
)×13 17
+11 13
,3 14
=
+6 17
×13 14
+11 13
×13 17
+11 13
,3 14
=
+6 17
+11 14
+11 17
,3 14
=(
+6 17
)+(11 17
+11 14
),3 14
=1+1,
=2.