脱式计算. 25×4/5+2.5% 9.6-11÷7+1/7×4 12×[(11/6-2/3)×3]
问题描述:
脱式计算. 25×
|
9.6-11÷7+
|
12×[(
|
答
(1)25×
+2.5%4 5
=20+2.5%
=20.025;
(2)9.6-11÷7+
×41 7
=9.6-
+11 7
4 7
=9.6-(
-11 7
)4 7
=9.6-1
=8.6;
(3)12×[(
-11 6
)×3]2 3
=12×[
×3-11 6
×3]2 3
=12×[
-2]11 2
=12×
-12×211 2
=66-24
=42.