Question

Efectuati calculele urmatoare an doua moduri: 2×(8+7)= ;5×(6+8)= ;7×(4+8)= ;4×(5+6)= ;(3+9)×8= ;(4+7)×7= ;(8+3)×4= ;(7+6)×2= ;13×(2+7)= ;21×(3+5)= ;52×(1+0)= ;30×(0+9)=

Answer 1

a. 2x(8+7)=2x15=30 sau 2x8+2x7=16+14=30
b. 5x(6+8)=5x14=70 sau 5x6+5x8=30+40=70
si asa le faci pe toate

Answer 2

2x(8+7)=2x15=30
2x(8+7)=2x8+2x7=16+14=30

5x(6+8)=5x14=70
5x(6+8)=5x6+5x8=30+40=70

7x(4+8)=7x12=84
7x(4+8)=7x4+7x8=28+56=84

4x(5+6)=4x11=44
4x(5+6)=4x5+4x6=20+24=44

(3+9)x8=12x8=96
(3+9)x8=8x3+8x9=24+72=96

(4+7)x7=11x7=77
(4+7)x7=7x4+7x7=28+49=77

(8+3)x4=11x4=44
(8+3)x4=4x8+4x3=32+12=44

(7+6)x2=13x2=26
(7+6)x2=2x7+2x6=14+12=26

13x(2+7)=13x9= 117
13x(2+7)=13x2+13x7=26+91=117

21x(3+5)=21x8=168
21x(3+5)=21x3+21x5=63+105=168

52x(1+0)=52x1=52
52x(1+0)=52x1+52x0=52+0=52

30x(0+9)=30x9=270
30x(0+9)=30x0+30x9=0+270=270