问题
解答题
|
答案
(1)7÷
-7 9
÷77 9
=7×
-9 7
×7 9
,1 7
=9-
,1 9
=8
;8 9
(2)15÷
+15×8 9 7 8
=15×
+15×9 8
,7 8
=15×(
+9 8
),7 8
=15×2,
=30;
(3)
÷[3 22
÷(5 4
-14 3
)]1 2
=
÷[3 22
÷5 4
],25 6
=
÷[3 22
×5 4
],6 25
=
÷3 22
,3 10
=
×3 22
,10 3
=
;5 11
(4)3-
×5 18
-27 40 13 16
=3-
-3 16
,13 16
=3-(
+3 16
),13 16
=3-1,
=2;
(5)
×9+7 9 7 9
=7+
,7 9
=7
;7 9
(6)
÷19 13
-7 5
×6 13 5 7
=
×19 13
-5 7
×6 13
,5 7
=(
-19 13
)×6 13
,5 7
=1×
,5 7
=
.5 7