问题
解答题
|
答案
(1)
×14×9 14 2 9
=9×2 9
=2;
(2)83×81 82
=(82+1)×81 82
=82×
+1×81 82 81 82
=81+81 82
=81
;81 82
(3)
×(125×34)4 17
=
×34×1254 17
=8×125
=1000;
(4)16×(
-1 2
)1 8
=16×
-16×1 2 1 8
=8-2
=6;
(5)
×2 5
+2 10 9 10
=
+2 25 9 10
=
;49 50
(6)1-
×5 14 2 9
=1-5 63
=
;58 63
(7)
×5 6
×161 8
=
×(5 6
×16)1 8
=
×25 6
=
;5 3
(8)16×
-5 8 5 14
=10-5 14
=9
;9 14
(9)
×20×9 10 4 7
=18×4 7
=
.72 7