问题
解答题
|
答案
(1)
×7 18
+1 4
÷3 4 18 7
=
×7 18
+1 4
×3 4 7 18
=
×(7 18
+1 4
)3 4
=
×17 18
=
;7 18
(2)
÷(12 7
-2 3
)1 4
=
÷12 7 5 12
=
×12 7 12 5
=
;144 35
(3)87×13 88
=(88-1)×13 88
=88×
-13 88 13 88
=13-13 88
=12
;75 88
(4)(
-2 23
)×23×352 35
=
×23×35-2 23
×23×352 35
=70-46
=24.