题目内容
(
|
2.5×(1.9+1.9+1.9+1.9) | ||||||||||||||||||||||
| 3.64÷4+4.36×25% | 2005
| ||||||||||||||||||||||
(9
|
| ||||||||||||||||||||||
|
142857÷117+285714÷117+571428÷117. |
(1)(
+
-
)×4×9
=(
+
-
)×36,
=
×36+
×36+
×36,
=6+4+3,
=13;
(2)2.5×(1.9+1.9+1.9+1.9)
=2.5×4×1.9,
=10×1.9,
=19;
(3)3.64÷4+4.36×25%
=3.64×25%+4.36×25%,
=(3.64+4.36)×25%,
=8×25%,
=2;
(4)2005
×
=(2004+1
)×
,
=2004×
+
×
,
=2003+1,
=2004;
(5)(9
+7
)÷(
+
)
=16
÷
,
=13;
(6)
+
+
+
+
+
+
=(1-
)+(1-
)+…+(1-
),
=1+1+1+1+1+1+1-(
+
+…+
),
=7-
,
=7-
,
=6
;
(7)
+
+
+
+
+
+
+
+
=(
++
+
+
)+(+
+
)+(
+
+
),
=
+
+
,
=
+
+
,
=5;
(8)142857÷117+285714÷117+571428÷117.
=142857×
+285714×
+571428×
,
=(142857+285714+571428)×
,
=999999×
,
=8547.
| 1 |
| 6 |
| 1 |
| 9 |
| 1 |
| 12 |
=(
| 1 |
| 6 |
| 1 |
| 9 |
| 1 |
| 12 |
=
| 1 |
| 6 |
| 1 |
| 9 |
| 1 |
| 12 |
=6+4+3,
=13;
(2)2.5×(1.9+1.9+1.9+1.9)
=2.5×4×1.9,
=10×1.9,
=19;
(3)3.64÷4+4.36×25%
=3.64×25%+4.36×25%,
=(3.64+4.36)×25%,
=8×25%,
=2;
(4)2005
| 1 |
| 2003 |
| 2003 |
| 2004 |
=(2004+1
| 1 |
| 2003 |
| 2003 |
| 2004 |
=2004×
| 2003 |
| 2004 |
| 2004 |
| 2003 |
| 2003 |
| 2004 |
=2003+1,
=2004;
(5)(9
| 2 |
| 7 |
| 2 |
| 9 |
| 5 |
| 7 |
| 5 |
| 9 |
=16
| 32 |
| 63 |
| 80 |
| 63 |
=13;
(6)
| 1 |
| 2 |
| 3 |
| 4 |
| 7 |
| 8 |
| 15 |
| 16 |
| 31 |
| 32 |
| 63 |
| 64 |
| 127 |
| 128 |
=(1-
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 128 |
=1+1+1+1+1+1+1-(
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 128 |
=7-
| 64+32+16+8+4+2+1 |
| 128 |
=7-
| 127 |
| 128 |
=6
| 1 |
| 128 |
(7)
| 1 |
| 3 |
| 3 |
| 4 |
| 2 |
| 5 |
| 5 |
| 7 |
| 7 |
| 8 |
| 9 |
| 20 |
| 10 |
| 21 |
| 11 |
| 24 |
| 19 |
| 35 |
=(
| 1 |
| 3 |
| 3 |
| 4 |
| 7 |
| 8 |
| 11 |
| 24 |
| 2 |
| 5 |
| 9 |
| 20 |
| 5 |
| 7 |
| 10 |
| 21 |
| 19 |
| 35 |
=
| 29 |
| 12 |
| 17 |
| 20 |
| 26 |
| 15 |
=
| 145 |
| 60 |
| 51 |
| 60 |
| 104 |
| 60 |
=5;
(8)142857÷117+285714÷117+571428÷117.
=142857×
| 1 |
| 117 |
| 1 |
| 117 |
| 1 |
| 117 |
=(142857+285714+571428)×
| 1 |
| 117 |
=999999×
| 1 |
| 117 |
=8547.
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