Question

Calculatj:
2/5+3/10 ; 2/9+2/3 ; 3/4+5/8 ; 7/8+1/2 ; 1/2+1/4 ; 3/10+2/5 ; 1/6+2/3 ; 3/5+1/20
Dau coroana !! Va rog e foarte urgent!!!!!!

Answer 1

2/5(amplificam cu 2)+3/ 10=4/10+3/10=7/10
2/9+2/3(ampl.3)=2/9+6/9=8/9
3/4+5/8=3/4(ampl.2)+5/8=6/8+5/8=11/8
7/8+1/2(ampl.4)=7/8+4/8=11/8
1/2(ampl.2)+1/4=2/4+1/4=3/4
3/10+2/5(ampl.2)=3/10+4/10=7/10
1/6+2/3(ampl.2)=1/6+4/6=5/6
3/5(ampl.4)+1/20=12/20+1/20=13/20

Answer 2

Răspuns

Explicație pas cu pas:

2\5+3\10=(4+3)\10=7\10

2\9+2\3=(2+6)\9=8\9

3\4+5\8=(6+5)\8=11\8

7\8+1\2=(7+4)\8=11\8

1\2+1\4=(2+1)\4=3\4

3\10+2\5=(3+4)\10=7\10

1\6+2\3=(1+4)\6=5\6

3\5+1\20=(12+1)\20=13\20