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脱式计算. 3375÷27×12 ÷0.25×25% (445-1.6×34)÷412 289×[134-(716-14)].

编辑:chaxungu时间:2026-04-27 13:21:16分类:小学数学题库

脱式计算.
3375÷27×12(0.75+10.2)÷0.25×25%(4
4
5
-1.6×
3
4
)÷4
1
2
2
8
9
×[1
3
4
-(
7
16
-
1
4
)].

(1)3375÷27×12,
=125×12,
=1500;

(2)(0.75+10.2)÷0.25×25%,
=10.95÷0.25×0.25,
=10.95÷(0.25÷0.25),
=10.95;

(3)(4
4
5
-1.6×
3
4
)÷4
1
2
,
=(4
4
5
-1.2)÷4
1
2
,
=3.6÷4
1
2
,
=0.8;

(4)2
8
9
×[1
3
4
-(
7
16
-
1
4
)],
=2
8
9
×[1
3
4
-
3
16
],
=2
8
9
×1
9
16
,
=
325
72
.