问题
解答题
怎样简便怎样算 3÷
(
0.625×(8.3-2.5×12%) 6.8×2.5+2.5×3.2
|
答案
(1)3÷
-3 7
÷3,3 7
=3×
-7 3
×3 7
,1 3
=7-
,1 7
=6
;6 7
(2)(
-1 3
+1 6
)×12,1 4
=
×12-1 3
×12+1 6
×12,1 4
=4-2+3,
=5;
(3)
÷[11 20
×(1 2
+2 3
)],4 5
=
÷[11 20
×1 2
+2 3
×1 2
],4 5
=
÷[11 20
+1 3
],2 5
=
×11 20
,15 11
=
;3 4
(4)0.625×(8.3-2.5×12%),
=0.625×(8.3-0.3),
=
×8,5 8
=5;
(5)6.8×2.5+2.5×3.2,
=(6.8+3.2)×2.5,
=10×2.5,
=25;
(6)
×7 4
+5 8
÷1 4 8 5
=
×7 4
+5 8
×1 4
,5 8
=(
+7 4
)×1 4
,5 8
=
×8 4
,5 8
=
,5 4
=1
.1 4