Question

Va rog un pic de ajutor

Answer 1

a) 13/4x-1/2=9/8
8×13/4x-8×1/2=8×9/8
2×13x-4=9
26x-4=9
26x=9+4
26x=13
x=13/26= 1/2; verificarea;13/4×1/2-1/2=9/8, 13/8-1/2=9/8, /13-4/8=9/8, 9/8=9/8
b) calculeaza o treime  din 9/10,
    9/10×1/3=3/10.
    apoi imulteste cu 2
    2×3/10=3/5. 
c)3×7/5=3/1×7/5=3×7/tot supra1×5= 21/5
   notam prin x un numar;
   x+6/5=21/5
   x=21/5-6/5
   x=21-6/ tot supra 5
   x=15/5
   x=3;
d) x/2+x/3=5/3
    6×x/2+6×x/3=6×5/3
    3x+2x=2×5
    5x=10
     x=10÷5
     x=2. sper ca team ajutat bafta.