问题
解答题
脱式计算: (1)(
(2)(
(3)(
(4)
|
答案
(1)(
+3 4
-5 6
)×242 3
=
×24+3 4
×24-5 6
×24,2 3
=18+20-16,
=22;
(2)(
+5 6
+7 12
)÷3 8 1 48
=(
+5 6
+7 12
)×48,3 8
=
×48+5 6
×48+7 12
×48,3 8
=40+28+18,
=86;
(3)(
-1 3
)×(1 6
÷5 8
)1 6
=(
-2 6
)×(1 6
×6),5 8
=
×1 6
,15 4
=
;5 8
(4)
÷[4 9
-(4 5
-1 3
)]1 5
=
÷[4 9
-(4 5
-5 15
)],3 15
=
÷[4 9
-4 5
],2 15
=
÷[4 9
-12 15
],2 15
=
×4 9
,3 2
=
.2 3