问题
解答题
0.
(x-4)×
1-
|
答案
(1)由于0.125×1.24=0.03,
所以0.
125×0.00…0 983个0
24积的小数点后有983+1028+1=2012个零,00…0 1028个0
则0.
125×0.00…0 983个0
24=0.000…(2012个0)3.00…0 1028个0
(2)(x-4)×
=1 3
x-1 4 1 6
-x 3
=4 3
x-1 4
,1 6
-x 3
-x 4
+4 3
=4 3
-x 4
+x 4
-4 3
,1 6
=x 12
,7 6
×12=x 12
×12,7 6
x=14.
(3)1-
-1 3
+7 12
-9 20
+11 30
-13 42
.15 56
=1-
-(1 3
+1 3
)+(1 4
+1 4
)-(1 5
+1 5
)+(1 6
+1 6
)-(1 7
+1 7
),1 8
=1-
-1 3
-1 3
+1 4
+1 4
-1 5
-1 5
+1 6
+1 6
-1 7
-1 7
,1 8
=1-
-1 3
-1 3
,1 8
=
-1 3
,1 8
=
.5 24