问题 解答题
脱式计算.(能简算的要简算)
0.25×12.5×8

6.4×
2
5
+
2
5
×3.6

[1-(
1
3
-
1
5
)]×
15
26
答案

(1)0.25×12.5×8,

=0.25×(12.5×8),

=0.25×100,

=25;

(2)6.4×

2
5
+
2
5
×3.6,

=(6.4+3.6)×

2
5

=10×

2
5

=4;

(3)[1-(

1
3
-
1
5
)]×
15
26

=[1-

2
15
15
26

=

13
15
×
15
26

=

1
2

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