问题 解答题
简便计算
43×99+43  
3
7
-
2
5
+
4
7
-
3
5
5
12
×
1
13
-
1
4
÷13   
3.5×98+35×0.2250×
1
5
+250×
4
5
11
3
×12.5×
9
10
×8.
答案

(1)43×99+43,

=43×(99+1),

=43×100,

=4300;

(2)

3
7
-
2
5
+
4
7
-
3
5

=(

3
7
+
4
7
)-(
2
5
+
3
5
),

=1-1,

=0;

(3)

5
12
×
1
13
-
1
4
÷13,

=

5
12
×
1
13
-
1
4
×
1
13

=(

5
12
-
1
4
)×
1
13

=

1
6
×
1
13

=

1
78

(4)3.5×98+35×0.2,

=3.5×98+3.5×2,

=3.5×(98+2),

=3.5×100,

=350;

(5)250×

1
5
+250×
4
5

=250×(

1
5
+
4
5
),

=250×1,

=250;

(6)

11
3
×12.5×
9
10
×8,

=(

11
3
×
9
10
)×(12.5×8),

=

33
10
×100,

=330.

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