问题 解答题
简算
950÷25
72×12.5×
1
9
7
8
-
7
18
+
1
8
-
5
18
18.5×72+1.85×280.
答案

(1)950÷25,

=(950×4)÷(25×4),

=3800÷100,

=38;

(2)72×12.5×

1
9

=72×

1
9
×12.5,

=8×12.5,

=100;

(3)

7
8
-
7
18
+
1
8
-
5
18

=(

7
8
+
1
8
)-(
7
18
+
5
18
),

=1-

2
3

=

1
3

(4)18.5×72+1.85×280,

=18.5×72+18.5×28,

=18.5×(72+28),

=18.5×100,

=1850.

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