问题
解答题
你认为怎样简便就怎样算: (1)12×
(2)(25+
(3)12×
(4)(
(5)[1-(
|
答案
①12×
÷6 5 3 10
=12×
×6 5 10 3
=48;
②(25+
)÷3 4 1 4
=(25+
)×43 4
=25×4+
×43 4
=100+3
=103;
③12×
-5 6
÷42 5
=12×
-5 6
×2 5 1 4
=10-1 10
=9
;9 10
④(
-1 3
)÷1 4
+1 2 2 3
=(
-1 3
)×2+1 4 2 3
=
×2-1 3
×2+1 4 2 3
=
-2 3
+1 2 2 3
=(
+2 3
)-2 3 1 2
=
-4 3 1 2
=
;5 6
⑤[1-(
+1 4
)]÷1 4 1 4
=[1-(
+1 4
)]×41 4
=1×4-(
+1 4
)×41 4
=4-(
×4+1 4
×4)1 4
=4-(1+1)
=4-2
=2.