问题
解答题
|
答案
(1)
+(1 8
-7 8
),5 12
=(
+1 8
)-7 8
,5 12
=1-
,5 12
=
;7 12
(2)4
-2.5+11 3
,3 4
=4
-21 3
+11 2
,3 4
=4
-24 12
+16 12
,9 12
=3
;7 12
(3)
-2 3
-1 9
,2 9
=
-(2 3
+1 9
),2 9
=
-2 3
,1 3
=
;1 3
(4)[16.8-(1.6+3.8)]÷1.9,
=[16.8-5.4]÷1.9,
=11.4÷1.9,
=6;
(5)9.8×100.1,
=9.8×(100+0.1),
=980+0.98,
=980.98;
(6)8.4÷3.5=2.4.