问题
解答题
计算下面各题,能简算的要简算. (
3200÷(1280-72×15) 5.89+8.17+2.83+4.11
|
答案
①(
-5 6
)×48,3 8
=
×48-5 6
×48,3 8
=40-18,
=22;
②3200÷(1280-72×15),
=3200÷(1280-1080),
=3200÷200,
=16;
③5.89+8.17+2.83+4.11,
=(5.89+4.11)+(8.17+2.83),
=10+11,
=21;
④
÷[(7 8
+1 2
)×3 5
],5 11
=
÷[7 8
×11 10
],5 11
=
÷7 8
,1 2
=
.7 4