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脱式计算.能简算的要简算 25×4×34 38×7+38 55×611-32×14 0.125×32×2.5 99.9+0.12+0.1+0.88 9+99+999+9×13.

编辑:chaxungu时间:2026-04-27 13:18:15分类:小学数学题库

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
.

(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.