题目内容

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.
(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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