问题 解答题
怎样算简便就怎样算
1.25×32×2.5
3
4
+
1
4
×
4
7
7.38-(1.57+2.38)
9
10
+
9
10
×99
1
6
÷[1÷(
3
5
-
3
10
)]
9315÷23+77.
答案

(1)1.25×32×2.5,

=1.25×8×4×2.5,

=10×10,

=100,

(2)

3
4
+
1
4
×
4
7

=

3
4
+
1
7

=

25
28

(3)7.38-(1.57+2.38),

=7.38-1.57-2.38,

=7.38-2.38-1.57,

=5-1.57,

=3.43;

(4)

9
10
+
9
10
×99,

=

9
10
×(1+99),

=

9
10
×100,

=90;

(5)

1
6
÷[1÷(
3
5
-
3
10
)],

=

1
6
÷[1÷
3
10
],

=

1
6
÷
10
3

=

1
20

(6)9315÷23+77,

=405+77,

=482.

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