Question

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Answer 1

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:

Answer 2

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

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

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

= $\frac{405+222+10}{90}$= $\frac{637}{90}$ = 7,0(7)