问题
解答题
|
答案
(1)15×
÷3 8 9 4
=
÷45 8 9 4
=2
;1 2
(2)20×(
+2 5
-1 6
)4 15
=20×(
-17 30
)4 15
=20×3 10
=6;
(3)
×3 5
+7 13
×3 5 6 13
=
×(3 5
+7 13
)6 13
=
×13 5
=
;3 5
(4)10-(
+4 3
×2)1 3
=10-(
+4 3
)2 3
=10-2
=8.