问题
解答题
计算: (1)
(2)
(3)
(4)
(5)
(6)
|
答案
(1)
,
+1 3 1 4 1-
×3 5 7 12
=
,7 12 1- 7 20
=
,7 12 13 20
=
×7 12
,20 13
=
;35 39
(2)
,0.5-
÷1 8 5 12 6
-41 5 3 4
=
,
-1 2
×1 8 12 5 6
-44 20 15 20
=
,
-1 2 3 10 29 20
=
,(
-1 2
)×203 10
×2029 20
=
;4 29
(3)
,5
-12 5 2 3
+3 8
×5 12 7 10
=
,5
-16 15 10 15
+3 8 7 24
=
,56 15 2 3
=
×56 15
,3 2
=
;28 5
(4)
,1-2
÷31 5 1 7 1
+1 4 2 5
=
,1-
×11 5 7 22 1
+5 20 8 20
=
,1- 7 10 33 20
=
×3 10
,20 33
=
;2 11
(5)
,(18-16
)×2.83 7 2.75+1 5 6
=
,(18-
)×2.8115 7 2
+13 4 5 6
=
,50.4-46 55 12
=4.4×
,12 55
=0.96.