问题
解答题
|
答案
(1)3-
-7 12 5 12
=3-(
+7 12
)5 12
=3-1
=2;
(2)
×5 7
+3 8
×5 8 5 7
=
×(5 7
+3 8
)5 8
=
×15 7
=
;5 7
(3)18×(
+4 9
)5 6
=18×
+18×4 9 5 6
=8+15
=23.
|
(1)3-
-7 12 5 12
=3-(
+7 12
)5 12
=3-1
=2;
(2)
×5 7
+3 8
×5 8 5 7
=
×(5 7
+3 8
)5 8
=
×15 7
=
;5 7
(3)18×(
+4 9
)5 6
=18×
+18×4 9 5 6
=8+15
=23.