问题
解答题
脱式计算,能简算的要简算. ①
②3÷
③
④98%×981+0.02×981. |
答案
①
÷(13 15
+1 4
),2 5
=
÷13 15
,13 20
=
;4 3
②3÷
-3 4
÷3,3 4
=4-
,1 4
=3
;3 4
③
×(12 5
+5 6
)+3 4
,1 5
=
×12 5
+5 6
×12 5
+3 4
,1 5
=2+
+9 5
,1 5
=2+(
+9 5
),1 5
=2+2,
=4;
④98%×981+0.02×981,
=(98%+0.02)×981,
=1×981,
=981.