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(1)725÷5÷5 (2)630÷3÷2 (3)47×30+57
(4)819÷9×46 (5)177+42×30 (6)29×(178-158)
(1)725÷5÷5
  =725÷25
  =29
(2)630÷3÷2
  =630÷6
  =105
(3)47×30+57
  =1410+57
  =1467
(4)819÷9×46
  =91×46
  =4186
(5)177+42×30
  =177+1260
  =1437
(6)29×(178-158)
  =29×20
  =580
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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)
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9
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(30)(
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3
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1
6
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4
)×12
(31)(
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3
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8
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24
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24
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1
3
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8
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1
3
+
1
8
-
1
24
(34)1.25×3.6+1.25×3
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5
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1
4
(35)3.3×
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4
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10
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1
2
×6.6+7.5×6
3
5
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(38)4.8×37+47×6.3 (39)9.5×8.8+0.12×95 (40)
19
20
×21
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30
×33
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45
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45
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45
÷42
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1
2
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7
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2
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4
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6
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9
×
13
14
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9
÷
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13
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20
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3
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2
3
(60)
6
11
×
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8
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8
×
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11
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4
÷
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4
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25
17
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1
3
×
9
8
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5
8
(63)
8
9
×[
3
7
÷(
2
3
+
1
7
)]
(64)(0.9+5)×3+2.3 (65)56×
1
57
(66)
3
4
+
1
4
÷
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4
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1
4
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4
+
1
4
)÷(
3
4
+
1
4
(68)
7
15
÷(
7
30
-
1
15
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30
-
1
15
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15
(70)7.2÷(5-0.75-0.25) (71)6.4+3.6÷0.5+4.5 (72)(6.4+3.6)÷0.5+4.5 (73)495÷55+495÷45
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8
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11
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25
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16
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8
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7
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10
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13
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21
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3
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3
28
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1
6
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7
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12
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2
×
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16
×45-
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16
÷
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45
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6
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12
13
×
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5
+
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3
×
1
2
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3
÷
3
8
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