问题
解答题
|
答案
①2-
-3 10
÷5 8
,25 28
=2-
-3 10
,7 10
=2-(
+3 10
),7 10
=2-1,
=1;
②4×58+84×1.2,
=232+100.8,
=332.8;
③
×2 23
+8 17
×9 23
,2 17
=
×8 23
+2 17
×9 23
,2 17
=
×(2 17
+8 23
)9 23
=
×2 17
,17 23
=
;2 23
④
+(2 3
+4 5
)÷1 5
,1 3
=
+1÷2 3
,1 3
=
+3,2 3
=3
.2 3