问题
解答题
|
答案
①7÷
-7 9
÷7,7 9
=7×
-9 7
×7 9
,1 7
=9-
,1 9
=8
;8 9
②15÷
+15×8 9
,7 8
=15×
+15×9 8
,7 8
=(
+9 8
)×15,7 8
=2×15,
=30;
③
÷[3 22
÷(5 4
-14 3
)],1 2
=
÷[3 22
÷5 4
],25 6
=
÷3 22
,3 10
=
;5 11
④3-
×5 18
-27 40
,13 16
=3-
-3 16
,13 16
=3-(
+3 16
),13 16
=3-1,
=2;
⑤
÷[8 15
×(5 32
+9 10
)],1 6
=
÷[8 15
×5 32
],32 30
=
×6,8 15
=
;16 5
⑥
×(7×26),1 26
=
×26×7,1 26
=1×7,
=7.