问题 解答题
计算下面各题,怎样简便就怎样算
7
9
+
3
8
+
5
8
+
2
9

36×(
3
4
+
1
6
-
2
9
)

3.4×2.77+0.23×3.4
[1-(
1
2
+
1
6
)]÷
1
3
答案

(1)

7
9
+
3
8
+
5
8
+
2
9

=(

7
9
+
2
9
)+(
3
8
+
5
8
),

=1+1,

=2;

(2)36×(

3
4
+
1
6
-
2
9
),

=36×

3
4
+36×
1
6
-36×
2
9

=27+6-8,

=25;

(3)3.4×2.77+0.23×3.4,

=3.4×(2.77+0.23),

=3.4×3,

=10.2;

(4)[1-(

1
2
+
1
6
)]÷
1
3

=[1-

2
3
]÷
1
3

=

1
3
÷
1
3

=1.

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