问题
解答题
|
答案
(1)3
×7,1 10
=(3×7)+(
×7),1 10
=21+
,7 10
=21
;7 10
(2)(
+1÷1 2
)÷2 7
,15 7
=(
+1×1 2
)×7 2
,7 15
=(
+1 2
)×7 2
,7 15
=4×
,7 15
=
,28 15
=1
;13 15
(3)9×
×3 8
,5 27
=9×
×3 8
,5 27
=
;5 8
(4)
×11 18
+5 9
×5 9
,7 18
=(
+11 18
)×7 18
,5 9
=1×
,5 9
=
;5 9
(5)2.35+
÷2 9
+2.35,1 9
=2.35+
×2 9
+2.35,9 1
=2.35+2+2.35,
=6.7;
(6)(
+1 4
)÷(1 2
-2 3
),2 5
=
÷3 4
,4 15
=
×3 4
,15 4
=
,45 16
=2
;13 16
(7)(
+3 8
)÷1 4
,3 16
=(
+3 8
)×1 4
,16 3
=
×3 8
+16 3
×1 4
,16 3
=2+
,4 3
=3
;1 3
(8)(
+3 4
-1 6
)÷3 24
,1 24
=
×24+3 4
×24-1 6
×24,3 24
=18+4-3,
=19;
(9)25÷(
-1 4
),1 9
=25÷(
-9 36
),4 36
=25×
,36 5
=180.