问题
解答题
|
答案
(1)
×7 12
×38 21
=
×32 9
=
;2 3
(2)(
+3 4
)÷2 3 7 12
=
×17 12 12 7
=
;17 7
(3)(
-4 5
)÷2 3 5 2
=
÷2 15 5 2
=
;4 75
(4)2÷
÷4 25 25 12
=2×
×25 4 12 25
=2×(
×25 4
)12 25
=2×3
=6;
(5)
×8 9
÷9 7 4 7
=
÷8 7 4 7
=2;
(6)[
-(7 8
+1 2
)]÷1 4 9 16
=[
-7 8
]÷3 4 9 16
=
×1 8 16 9
=
.2 9