问题
解答题
用简便方法计算.
|
答案
(1)
×99+18 25
,18 25
=
×(99+1),18 25
=
×100,18 25
=72;
(2)12.9×97+12.9×4-12.9,
=12.9×(97+4-1),
=12.9×100,
=1290;
(3)
×3 4
+9 10
÷11 4
,1 9
=(
+3 4
)×1 4
,9 10
=1×
,9 10
=
.9 10