ajutorŕrrrrrrrrrrrrr​

Răspuns:

12/5+6/25-1/4=240+24-25=239/100

235/100+61/10-1204/100=(235+610-1204)/100

4/3+1,(6)-2,3(9)=4/3+1 6/9-2 39-3/90 = 4/3+15/9-180*36/90 = (12+15-18*36)/9

6-8,1 +4,(3) = 6-81/10+4 3/9 = 6-81/10+39/9 = (6*90-81*9+10*39)/90

-4+9.5+2.4(6)+1/9-0/90 = -4+95/10+ 2 46-4/90+1/9-0 = (-90*4+9*95+180*42+10)/90

Explicație pas cu pas:

Răspuns:

1) se aduce la acelasi numitor  100

( 12*20 + 6*4- 1*25)/100= (240 + 24 - 25)/100= 239/100= 2,39

2) 8,45- 12,04= - 3.59

3) [tex]\frac{4}{3}[/tex] + [tex]\frac{16-1}{9}[/tex] - [tex]\frac{239-23}{90 }[/tex] = [tex]\frac{4}{3}[/tex] + [tex]\frac{15}{9}[/tex] - [tex]\frac{24}{10}[/tex]= [tex]\frac{4}{3} + \frac{5}{3}[/tex] - [tex]\frac{12}{5}[/tex]= [tex]\frac{4*5+ 5*5- 12*3}{15}[/tex]= [tex]\frac{20+25-36}{15}[/tex]= [tex]\frac{9}{15} = \frac{3}{5}[/tex]

4) 6- [tex]\frac{81}{10}[/tex] + [tex]\frac{43-4}{9}[/tex]= 6- [tex]\frac{81}{10}[/tex] + [tex]\frac{39}{9}[/tex]= 6-[tex]\frac{81}{10}[/tex] +[tex]\frac{13}{3}[/tex]= [tex]\frac{6*30-81*3+ 13*10}{30}[/tex]= [tex]\frac{180- 243+ 130}{30}[/tex]= [tex]\frac{67}{30}[/tex]

5) (9,5-4) + [tex]\frac{246-24}{90}[/tex] + [tex]\frac{1}{9}[/tex] - 0 = 4.5 + [tex]\frac{222}{90}[/tex] + [tex]\frac{1}{9}[/tex] = [tex]\frac{45}{10}[/tex] + [tex]\frac{111}{45}[/tex] + [tex]\frac{1}{9}[/tex]= [tex]\frac{9}{2}[/tex] + [tex]\frac{111}{45}[/tex] + [tex]\frac{1}{9}[/tex]= [tex]\frac{9*45+ 222+ 10}{90}[/tex]=

= [tex]\frac{405+222+10}{90}[/tex]= [tex]\frac{637}{90}[/tex] = 7,0(7)