问题
解答题
能简算的要简算. (1)4.82×12.5×8 (2)18×
(3)
(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×
-5×5 7
,4 7
=
-90 7
,20 7
=
,70 7
=10;
(3)
×998,1997 1998
=(1-
)×998,1 1998
=1×998-
×998,1 1998
=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.