Question

计算下面各题：5/14÷20/21×3/4 [2-(1/2-1/3]×6/5= == == =5/6÷3/4+1/6÷3？

Answer 1

5/14÷20/21× 3/4 [2-(1/2-1/3]×6/5
= 5/14×21/20×3/4 ＝[2-(3/6-2/6]×6/5
= 1／2×3／4×3／4 ＝11／6×6／5
＝9／32 ＝11／5
5/6÷3/4+1/6÷3/4 4/5÷[(3/4-1/2)×4/5]
= （5／6＋1／6）×4／3 =4／5÷（1／4×4/5）
=4／3 =4／5×5 =
＝4
（2/3+1/4)÷3/8 4/5÷（1/5+4/15）
= 11／12×8／3 =4/5×15／7
= 22／9 =12／7
（5/8+5/12）×4/15
=25／24×4/15
=5／18,10,第1题＝3/8*3/4=9/32
第2题＝11/6*6/5=11/5
第3题=1*4/3=4/3
第4题=1/(1/4)=4
第5题 =11/12*8/3=22/9
第6题=4/5*15/7=12/7
第7题=(1/2+1/3)*1/3=5/18,2,5/14÷20/21×3/4 [2-(1/2-1/3]×6/5
= 9/32 =11/5
5/6÷3/4+1/6÷3/4 4/5÷[(3/4-1/2)×4/5]
= 4/3 =4
（2/...,2,正
C
设重x千克
15×400.5=20x
x=300.375
第①种长为6.28宽为12.56第②种长为12.56宽为6.28
表面积比例 1：1
体积 ①12.56÷3.14÷2=2 3.14×2²×6.28 ②6.28÷3.14÷2=1 3.14×1²×12.56 所以体积比例2:1
图呢!,1,计算下面各题：
5/14÷20/21×3/4 [2-(1/2-1/3]×6/5
= =
= =
= =
5/6÷3/4+1/6÷3/4 4/5÷[(3/4-1/2)×4/5]
= =
= =
= =
（2/3+1/4)÷3/8 4/5÷（1/5+4/15）
= =
= =
= =
（5/8+5/12）×4/15
=
=
=