问题
解答题
能简算的要简算. ①23×
②1.36×2.7+13.6×0.73 ③0.25×1.25÷
④(
⑤[1-
⑥2008×
|
答案
①23×
+57÷3 8
,8 3
=(23+57)×
,3 8
=80×
,3 8
=30;
②1.36×2.7+13.6×0.73,
=1.36×2.7+1.36×7.3
=1.36×(2.7+7.3),
=1.36×10,
=13.6;
③0.25×1.25÷
,1 32
=0.25×1.25×32,
=(0.25×4)×(1.25×8),
=1×10,
=10;
④(
+3 8
-7 8
)×24,2 3
=
×24+3 8
×24-7 8
×24,2 3
=9+21-16,
=14;
⑤[1-
÷(7 8
+5 6
×1 2
)]÷1 3
,7 12
=[1-
÷1]÷7 8
,7 12
=
÷1 8
,7 12
=
;3 14
⑥2008×
,1 2007
=(2007+1)×
,1 2007
=2007×
+1 2007
,1 2007
=1+
,1 2007
=1
.1 2007