问题
解答题
简便计算: (1)-9
(2)-52×
|
答案
(1)原式=(
-10)×811 9
=
×81-10×811 9
=9-810
=-801;
(2)原式=-25×
+25×3 2
-25÷85 8
=-
+75 2
-125 8 25 8
=-25,
简便计算: (1)-9
(2)-52×
|
(1)原式=(
-10)×811 9
=
×81-10×811 9
=9-810
=-801;
(2)原式=-25×
+25×3 2
-25÷85 8
=-
+75 2
-125 8 25 8
=-25,