问题
解答题
脱式计算.
|
答案
(1)99×87+87,
=(99+1)×87,
=100×87,
=8700;
(2)18.7-3.375-6.625,
=18.7-(3.375+6.625),
=18.7-10,
=8.7;
(3)5
×(2 5
+0.5)÷23 4
,1 4
=5
×2 5
÷25 4
,1 4
=6
÷23 4
,1 4
=3;
(4)
÷[(4 15
-5 7
)÷3 14
],3 4
=
÷[4 15
÷1 2
],3 4
=
÷4 15
,2 3
=
.2 5