问题 解答题
脱式计算,能简算的要简算
2
5
×4×
3
4
3
8
×7+
3
8
55×
6
11
-32×
1
4
0.125×32×2.599.9+0.12+0.1+0.889+99+999+9×
1
3
答案

(1)

2
5
×4×
3
4

=

2
5
×(4×
3
4
),

=

2
5
×3,

=

6
5

(2)

3
8
×7+
3
8

=

3
8
×(7+1),

=

3
8
×8,

=3;

(3)55×

6
11
-32×
1
4

=30-8,

=22;

(4)0.125×32×2.5,

=0.125×(4×8)×2.5,

=(0.125×8)×(4×2.5),

=1×10,

=10;

(5)99.9+0.12+0.1+0.88,

=(99.9+0.1)+(0.12+0.88),

=100+1,

=101;

(6)9+99+999+9×

1
3

=9+99+999+3,

=9+99+999+(1+1+1),

=(9+1)+(99+1)+(999+1),

=10+100+1000,

=1110.

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