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直接写出计算结果:125×25×32=4.9×512+4.9+312×4.9=29×1728=-34-25=

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

直接写出计算结果:
125×25×32=
4.9×5
1
2
+4.9+3
1
2
×4.9=
29×
17
28
=
(0.12×40+13×0.4)-
3
4
-25=(1)125×25×32,
=125×25×(4×8),
=(125×8)×(25×4),
=1000×100,
=100000;

(2)4.9×5
1
2
+4.9+3
1
2
×4.9,
=4.9×(5
1
2
+1+3
1
2
),
=4.9×10,
=49;

(3)29×
17
28
,
=(28+1)×
17
28
,
=
17
28
×28+1×
17
28
,
=17+
17
28
,
=17
17
28
;

(4)(0.12×40+13×0.4)-
3
4
-25,
=(12+13)×0.4-
3
4
-25,
=10-0.75-25,
=-15.75.