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能简算的要简算.(1)4.82×12.5×8(2)18×57−5×47(3)19971998×998(4)(8.3×35.7+35.7×1.7)÷3.57.

题目详情
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.
▼优质解答
答案和解析
(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.