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25×3×4=25×4×3運(yùn)用了
乘法交換
乘法交換
律.
分析:25×3×4把3和4兩個(gè)因數(shù)的位置交換,就可得到25×4×3.
解答:解:25×3×4=25×4×3運(yùn)用了 乘法交換律.
故答案為:乘法交換.
點(diǎn)評(píng):乘法交換律:交換兩個(gè)因數(shù)的位置的位置,積不變.
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科目:小學(xué)數(shù)學(xué) 來源: 題型:閱讀理解

1.
(1)438+203 (2)256+199 (3)416-302 (4)325-198
(5)278+498 (6)3.6+2.7+6.4+7.3 (7)
4
9
+
5
6
+
5
9
+2
1
6
(8)1.3+4.25+3.7+3
(9)1874-324-476 (10)5-1.4-1.6 (11)30-8.12-4.13-7.75 (12)
7
8
-
4
5
+
1
8
(13)4.3-2.45+5.7-6.55 (14)125×48 (15)25×32 (16)35×1.4
(17)1.25×88 (18)0.25×444 (19)32×0.25×12.5 (20)25×80×0.04×125
(21)1.9×4×0.5 (22)25×1.25×4×0.8 (23)(1.6+1.6+1.6+1.6)×2.5 (24)(0.7+0.7…+0.7)×12.5(80個(gè)0.7相加)
(24)9.9×8.6+8.6 (25)99×5.4
(26)4.8×1.01 (27)95×101-95 (28)95×102-190 (29)95.6×18+0.4×18
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6
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1
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1
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5
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4
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10
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30
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45
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48
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科目:小學(xué)數(shù)學(xué) 來源: 題型:

1125-997= 998+1246+9989= (8700+870+87)÷87= 125×8.8=
1.3+4.25+3.7+3.75= 17.15-(3.5-2.85)= 3.4×99+3.4= 4.8×1.01=
0.4×(2.5÷73)= (1.6+1.6+1.6+1.6)×25       
4
9
+
5
6
-
7
18
)÷
1
36
=
7
25
×100
1
7
=
12.3-2.45-5.7-4.55=
7
9
÷2
1
5
+
5
11
×
2
9
=
0.125×0.25×64= 64.2×87+0.642×1300=
78×36+7.8×741-7
4
5
=
13
21
×17+
17
12
×8=
7
8
×
1
2
+0.125×
1
2
+0.5=
2.42÷
3
4
+4.58×1
1
3
-4÷3=
25÷100
25
26
=
4.25-3
5
6
-(2
1
6
-1
3
4
)=
3.8÷3.9+3.9÷0.1+0.1÷3.9= 12.1-(
1
15
+
1
21
)×105=
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科目:小學(xué)數(shù)學(xué) 來源:專項(xiàng)題 題型:填空題

25×3×4=25×4×3運(yùn)用了(    )律。 

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