题目内容
(1)(28×
+12×175%)÷
(2)0.35÷0.125÷64÷0.5÷0.25
(3)1.25×98+12
×
+1
(4)3
×2345+555÷
+654.3×36
(5)
+
-
+
-
+
-
(6)
+
+…
=2008.
| 7 |
| 4 |
| 21 |
| 8 |
(2)0.35÷0.125÷64÷0.5÷0.25
(3)1.25×98+12
| 1 |
| 2 |
| 1 |
| 10 |
| 1 |
| 4 |
(4)3
| 3 |
| 5 |
| 25 |
| 256 |
(5)
| 1 |
| 2 |
| 5 |
| 6 |
| 7 |
| 12 |
| 9 |
| 20 |
| 11 |
| 30 |
| 13 |
| 42 |
| 15 |
| 56 |
(6)
| x |
| 1×2 |
| x |
| 2×3 |
| x |
| 2008×2009 |
(1)(28×
+12×175%)÷
,
=(28×
+12×175%)×
,
=28×
×
+12×175%×
,
=
+8,
=26
;
(2)0.35÷0.125÷64÷0.5÷0.25,
=0.35÷(0.125×64×0.5×0.25),
=0.35÷(0.125×8×8×0.5×0.25),
=0.35÷[(0.125×8)×(0.5×0.25×8)],
=0.35÷[1×1],
=0.35÷1,
=0.35;
(3)1.25×98+12
×
+1
,
=1.25×98+12.5×0.1+1.25,
=1.25×98+1.25×1+1.25,
=1.25×(98+1+1),
=1.25×100,
=125;
(4)3
×2345+555÷
+654.3×36,
=3.6×2345+555÷
+6543×3.6,
=3.6×2345+6543×3.6+555÷
,
=3.6×(2345+6543)+555×
,
=3.6×8888+5683.2,
=37680;
(5)
+
-
+
-
+
-
,
=1-
+
+
-
-
+
+
-
-
+
+
-
-
,
=1-
,
=
;
(6)
+
+…
=2008,
x-
+
-
+…+
-
=2008,
x-
=2008,
x=2008,
x÷
=2008÷
,
x=2009.
| 7 |
| 4 |
| 21 |
| 8 |
=(28×
| 7 |
| 4 |
| 8 |
| 21 |
=28×
| 7 |
| 4 |
| 8 |
| 21 |
| 8 |
| 21 |
=
| 56 |
| 3 |
=26
| 2 |
| 3 |
(2)0.35÷0.125÷64÷0.5÷0.25,
=0.35÷(0.125×64×0.5×0.25),
=0.35÷(0.125×8×8×0.5×0.25),
=0.35÷[(0.125×8)×(0.5×0.25×8)],
=0.35÷[1×1],
=0.35÷1,
=0.35;
(3)1.25×98+12
| 1 |
| 2 |
| 1 |
| 10 |
| 1 |
| 4 |
=1.25×98+12.5×0.1+1.25,
=1.25×98+1.25×1+1.25,
=1.25×(98+1+1),
=1.25×100,
=125;
(4)3
| 3 |
| 5 |
| 25 |
| 256 |
=3.6×2345+555÷
| 25 |
| 256 |
=3.6×2345+6543×3.6+555÷
| 25 |
| 256 |
=3.6×(2345+6543)+555×
| 256 |
| 25 |
=3.6×8888+5683.2,
=37680;
(5)
| 1 |
| 2 |
| 5 |
| 6 |
| 7 |
| 12 |
| 9 |
| 20 |
| 11 |
| 30 |
| 13 |
| 42 |
| 15 |
| 56 |
=1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 8 |
=1-
| 1 |
| 8 |
=
| 7 |
| 8 |
(6)
| x |
| 1×2 |
| x |
| 2×3 |
| x |
| 2008×2009 |
x-
| x |
| 2 |
| x |
| 2 |
| x |
| 3 |
| x |
| 2008 |
| x |
| 2009 |
x-
| x |
| 2009 |
| 2008 |
| 2009 |
| 2008 |
| 2009 |
| 2008 |
| 2009 |
| 2008 |
| 2009 |
x=2009.
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