Question

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1.Estimati ptin numere intregi rezultatele, calculati si comparati cu estimarile facute:
a. 2,5 + 3,75 ; b. -2,5 +3,75; c. 2,5 - 3,75; d. 3,75 * (-2,5); e. (3,75) : (-2,5)
2. Efectuati: a. - 5/12 * 3/20; b. (+ 3/20) : (+5/12)
6. Efectuati:
a. -1,1(6) : (-1,75) + 0,(3) * (-0,5)
b. 3 intregi si 11/15 : [ 2-2 intregi si 2/5 * (5/9 - 1/2)]

Answer 1

1)2,5+3,75=6,25
-2,5+3,75=1,25
2,5-3,75=-1,25
3,75*(-2,5)=-9,375
3,75:(-2,5)=-1,5
2)-5/12*3/20=-15/240=-1/16=-0,0625
3/20:5/12=3/20*12/5=36/100=0,36
6) 3int 11/15:[2-2int2/5*(5/9-1/2)]=
56/15:[2-12/5*(10/18-9/18)]=
56/15:[2-12/5*1/18]=
56/15:[2-12/90]=56/15:[2-6/15]=
56/15:[30/15-6/15]=56/15:24/15=56/15*15/24=56/24=2,(3)