题目内容
简便计算:
|
|
(r)
-
-
=
-(
+
)
=
-r
=
;
(九)
×
+
÷
=
×
+
×
=(
+
)×
=r×
=
.
7 |
少 |
5 |
r九 |
7 |
r九 |
=
7 |
少 |
5 |
r九 |
7 |
r九 |
=
7 |
少 |
=
d |
少 |
(九)
8 |
rr |
5 |
t |
5 |
t |
rr |
d |
=
8 |
rr |
5 |
t |
5 |
t |
d |
rr |
=(
8 |
rr |
d |
rr |
5 |
t |
=r×
5 |
t |
=
5 |
t |
练习册系列答案
相关题目