问题
解答题
用递等式计算.
|
答案
0.625×(8.3-2.5×0.12),
=0.625×(8.3-0.3),
=0.625×8,
=5;
3÷
-3 7
÷3,3 7
=3×
-7 3
×3 7
,1 3
=7-
,1 7
=6
;6 7
÷[9 20
×(1 2
+2 3
)],4 5
=
÷[9 20
×1 2
],22 15
=
×9 20
,15 11
=
.27 44