问题
解答题
递等式计算.(能简便计算的要简便计算)
|
答案
826-765÷15,
=826-51,
=775;
(2)7.2×99+7.2,
=7.2×(99+1),
=720;
(3)
÷[(3 4
-3 5
)×1 4
],3 7
=
÷[3 4
×7 20
],3 7
=
×3 4
,20 3
=5;
(4)6.13-
-2 3
+0.87,1 3
=6.13+0.87-(
+2 3
),1 3
=7-1,
=6;
(5)36×(
-3 4
+1 6
),2 9
=36×
-36×3 4
+36×1 6
,2 9
=27-6+8,
=29;