Question

Oblicz: 2/5-[1.3*4/13-0.8] 5/6-[0.6:3/8-1.6] 14:2 2/9-8.4*1 2/7 [3.2+2/5]:[0.5-3.2]*4 1/2 10.3-[-4.2]*1/6-.2.5:1/4 [-2/3*1 1/8+2/9*3/8]:1/8 {-2]*3:[1.6]-[4.5*1 2/3-3.75]0.004 2.5+[2/3-1.8:1 1/5]:[-1/3]

Answer 1

2/5-[1.3*4/13-0.8]=2/5-[13/10*4/13-8/10]=2/5-[4/10-8/10]=4/10-(-4/10=

4/10+4/10=8/10=4/5

 

5/6-[0.6:3/8-1.6] =5/6-[6/10*8/3-16/10]=5/6-[16/10-16/10]=5/6-0=5/6

 

14:2 2/9-8.4*1 2/7=14/1:20/9-84/10*9/7=14/1*9/20-108/10=63/10-108/10=

= -45/10=-4 1/2

 

[3.2+2/5]:[0.5-3.2]*4 1/2=[3 1/5+2/5]:(-2,7)*9/2=3 3/5:(-27/10)*9/2=

=18/5*(-10/27)*9/2=-6

 

10.3-[-4.2]*1/6-.2.5:1/4=10 3/10-[-42/10]*1/6-25/10*4/1=

=10 3/10+7/10-100/10=11-10=1

 

[-2/3*1 1/8+2/9*3/8]:1/8 =[-2/3*9/8+1/12]*8=[9/12+1/12]*8=

10/12*8/1=20/3=6 2/3

 

{-2]*3:[1.6]-[4.5*1 2/3-3.75]0.004 = jaki jest znak przed 0,004???

 

2.5+[2/3-1.8:1 1/5]:[-1/3]=2 1/2+[2/3-18/10:6/5]*(-3)=

=2 1/2+[2/3-18/10*5/6]*(-3)=2 1/2+[2/3-3/2]*(-3)=2 1/2+[-5/6]*(-3)=

2 1/2+5/2=2 6/2=5