脱式计算.(1)0.25× 4 5 +2.5% (2)9.6-11÷7+ 1 7 ×4 &...

脱式计算.(1)0.25× 4 5 +2.5% (2)9.6-11÷7+ 1 7 ×4 (3) 12×[( 11 6 - 2 3 )×3] .
2025-04-06 03:42:30
推荐回答(1个)
回答1:

(1)0.25×
4
5
+2.5%,
=0.25×0.8+0.025,
=0.2+0.025,
=0.225;

(2)9.6-11÷7+
1
7
×4   
=9.6- 11×
1
7
+
1
7
×4,
=9.6-(11-4)×
1
7

=9.6-7×
1
7

=9.6-1,
=8.6;

(3) 12×[(
11
6
-
2
3
)×3]

=12×[(
11
6
-
4
6
)×3],
=12×[
7
6
×
3],
=12×
7
2

=42.