问题
解答题
|
答案
(1)
=0.12:1.5,6.4 x
0.12X=6.4×1.5,
0.12X=9.6,
0.12X÷0.12=9.6÷0.12,
X=80;
(2)5x+5×2.4-x=18.48,
4x+12=18.48,
4x+12-12=18.48-12,
4x=6.48,
4x÷4=6.48÷4,
x=1.62;
(3)(1
-1 2
+1 5
)-(3 8
+3 8
),4 5
=1
-1 2
+1 5
-3 8
-3 8
,4 5
=1
-(1 2
-1 5
)+(4 5
-3 8
),3 8
=1
-1-0,1 2
=
;1 2
(4)2008÷2008
,2008 2009
=2008÷
,2008×2009+2008 2009
=2008÷
,2008×(2009+1) 2009
=2008÷
,2008×2010 2009
=2008×
,2009 2008×2010
=
;2009 2010
(5)(9
+72 7
)÷(2 9
+5 7
),5 9
=16
÷32 63
,80 63
=16
×32 63
,63 80
=(16+
)×32 63
,63 80
=16×
+63 80
×32 63
,63 80
=
+63 5
,2 5
=13;
(6)
+1 3
+1 15
+1 35
+1 63
+1 99
,1 143
=
+1 1×3
+1 3×5
+1 5×7
+1 7×9
+1 9×11
,1 11×13
=
×(1-1 2
+1 3
-1 3
+1 5
-1 5
+1 7
-1 7
+1 9
-1 9
+1 11
-1 11
),1 13
=
×(1-1 2
),1 13
=
×1 2
,12 13
=
.6 13