问题
解答题
怎样算简便就怎样算. 9×
(5.6-1.6÷2)×2.5
|
答案
(1)9×
+5 18
×9,13 18
=(
+5 18
)×9,13 18
=1×9,
=9;
(2)(5.6-1.6÷2)×2.5,
=(5.6-0.8)×2.5,
=4.8×2.5,
=12;
(3)
÷[1 8
×( 1 25
+2 5
)],1 10
=
÷[1 8
×1 25
],1 2
=
×50,1 8
=6.25.