题目内容

怎样简便就怎样计算.
(21+
7
1g
)×
1
7
8
×
7
9
+
2
8
×
9
1
8
8
×9.8g-
8
8
×9.8g
2
9
+
7
16
+
9
+
8
16
1
18
×(
1
g
+
1
12
÷
1
12
(八.8-7
1
2
÷2.8
÷
1
12
(1)(71+
7
13
)×
1
7

=71×
1
7
+
7
13
×
1
7

=3+
1
13

=3
1
13


(7)
4
8
×
7
x
+
7
8
×
4
x

=
4
8
×(
7
x
+
7
x

=
4
8
×1
=
4
8


(3)1
8
8
×x.83-
8
8
×x.83
=(1
8
8
-
8
8
)×x.83
=1×x.83
=x.83;

(4)
7
x
+
7
16
+
4
x
+
8
16

=
7
x
+
4
x
+(
8
16
+
7
16

=
7
3
+
3
4

=
17
17


(8)
1
18
×(
1
3
+
1
17
)÷
1
17

=
1
18
×
8
17
×17
=
1
3


(6)(4.8-7
1
7
÷7.8
÷
1
17

=(4.8-3)÷
1
17

=1.8×17
=71.6.
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