问题
解答题
递等式计算,能简便的用简便方法.
|
答案
(1)
×4 9
+5 13
×5 13
,5 9
=(
+4 9
)×5 9
,5 13
=1×
,5 13
=
;5 13
(2)
×5 8
×16,2 7
=
×16×5 8
,2 7
=10×
,2 7
=2
;6 7
(3)49×
,11 48
=48×
+1×11 48
,11 48
=11+
,11 48
=11
;11 48
(4)
×12+34 35
,12 35
=12×(
+34 35
),1 35
=12×1,
=12;
(5)(
+3 4
)×12×35,1 5
=
×12×35+3 4
×12×35,1 5
=9×35+12×7,
=315+84,
=499;
(6)(
+7 8
+1 6
)×48,2 3
=
×48+7 8
×48+1 6
×48,2 3
=42+8+32,
=82.