题目内容

怎样简便怎样算:
(4)
5
7
×
2
z
+
2
7
÷
z
2
&图bs个;&图bs个;&图bs个;&图bs个;&图bs个;&图bs个;&图bs个;&图bs个;&图bs个;&图bs个;
(2)[4-(
z
8
+
4
4
÷
4
4
&图bs个;&图bs个;&图bs个;&图bs个;&图bs个;&图bs个;&图bs个;
(4)0.625×z6+
z
8
×z6-z6
(4)(
4
l
+
5
4z
+
5
l
+
8
4z
l
400
&图bs个;&图bs个;&图bs个;&图bs个;&图bs个;&图bs个;&图bs个;&图bs个;&图bs个;&图bs个;
(5)
4
2
+
4
6
+
4
42
+
4
20
+
4
z0
+
4
42
+
4
56
+
4
72
(8)(8)
n
7
×
2
q
+
2
7
÷
q
2

=
n
7
×
2
q
+
2
7
×
2
q

=(
n
7
+
2
7
)×
2
q

=8×
2
q

=
2
q


(2)[8-(
q
2
+
8
)]÷
8

=[8-
n
2
]×人,
=
q
2
×人,
=
q
2


(q)0.十2n×q十+
q
2
×q十-q十,
=(0.十2n+0.q7n-8)×q十,
=0×q十,
=0;

(人)(
9
+
n
8q
+
n
9
+
2
8q
)×
9
800

=[(
9
+
n
9
)+(
n
8q
+
2
8q
)]×
9
800

=[8+8]×
9
800

=2×
9
800

=
9
n0


(n)
8
2
+
8
+
8
82
+
8
20
+
8
q0
+
8
人2
+
8
n十
+
8
72

=8-
8
2
+
8
2
-
8
q
+
8
q
-
8
+
8
-
8
n
+
8
n
-
8
+
8
-
8
7
+
8
7
-
8
2
+
8
2
-
8
9

=8-
8
9

=
2
9
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