Question

Ajutati-ma va rog muuult!
1. 2+4+6+8+10+....+20=?
2. 32×(3,6+14,40-15)-0,6×160
3. 19×7×[3+2×(14×2-7,4)+2,1]+22,12
EXERCITIILE TREBUIE REZOLVATE PAS CU PAS(am nevoie în special de prima)

Answer 1

2(1+2+3+........+10)=2*10*11/2=110( se apl. suma gauss S=n*(n+1)/2
32*(18-15)-96=32*3-96=96-96=0
133*[3+2*(28-7.4)+2.1]+22.12=133*(3+56-14.8+2.1)+22.12=
133*44.2+22.12=5878.6+22.12=5900.72

Answer 2

1. 2+4+6+8+10+12+14+16+18+20 = 110.
2. 1) 3,6+14,40 = 18
2) 18-15 = 3
3) 32× 3 = 96
4) 0,6 × 160 = 96
5) 96-96 = 0
RS FINAL = 0
3. 1)14×2= 28
2) 28-7,4 =20,6
3) 2×20,6 = 41,2
4) 3+41,2 = 44,2
5) 44,2 + 2,1 = 46,3
6)7×46,3 = 324,1
7)19×324,1 = 6157,9
8) 6157,9 + 22,12 = 6180,02
RS FINAL 6180,02
Cu placere!