问题 解答题
能简算的要简算.
(1)4.82×12.5×8
(2)18×
5
7
-5×
4
7

(3)
1997
1998
×998

(4)(8.3×35.7+35.7×1.7)÷3.57.
答案

(1)4.82×12.5×8,

=4.82×(12.5×8),

=4.82×100,

=482;

(2)18×

5
7
-5×
4
7

=

90
7
-
20
7

=

70
7

=10;

(3)

1997
1998
×998,

=(1-

1
1998
)×998,

=1×998-

1
1998
×998,

=998-

998
1998

=997

500
999

(4)(8.3×35.7+35.7×1.7)÷3.57,

=(8.3+1.7)×35.7÷3.57,

=10×35.7÷3.57,

=357÷3.57,

=100.

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