问题
解答题
怎样算简便就怎样算. (1)(
(2)3.7×125%+1.25×2.7+1
(3)5×
|
答案
(1)(
+20%)×1 2 5 6
=(
+1 2
)×1 5
,5 6
=
×7 10
,5 6
=
;7 12
(2)3.7×125%+1.25×2.7+1
×3.6,1 4
=3.7×1.25+1.25×2.7+1.25×3.6,
=1.25×(3.7+2.7+3.6),
=1.25×10,
=12.5;
(3)5×
+75%×6-0.75,3 4
=5×0.75+0.75×6-0.75,
=(5+6-1)×0.75,
=10×0.75,
=7.5.