问题
解答题
简算.
|
答案
(1)23×
,13 22
=(22+1)×
,13 22
=22×
+1×13 22
,13 22
=13+
,13 22
=13
;13 22
(2)
×40-7 16
÷5 16
,1 40
=
×40-7 16
×40,5 16
=(
-7 16
)×40,5 16
=
×40,1 8
=5;
(3)
×46.7+52.3×3 4
+3 4
,3 4
=
×(46.7+52.3+1),3 4
=
×100,3 4
=75;
(4)(
+4 17
)×17×25,1 25
=(
+4 17
)×(17×25),1 25
=(
×17×25)+(4 17
×25×17),1 25
=(4×25)+(1×17),
=100+17,
=117.