Question

Rezolvă, ca în exemplul dat: Model: (8 x 3) + (8 x 2) = 8 x (3+2)=8 x 5 = 40 (423)+(4x2)....... (2x9)-(2x4)= ... (8150)+(8140)=.... (4x 70-4x50= . 100x7)+(20x7)= ..... (80x5)–(30x5)= . .. va rog dau inima 5 stele si 50 de puncte plss​

Answer 1

Răspuns:

423+(4x2)=423·4+423·2=1692+846=2538

(2x9)-(2x4)=18-8=10

(2x9)-(2x4)=2(9-4)=2·5=10

4x 70-4x50= 280-200=80

4x 70-4x50=4(70-50)=4·20=80

(100x7)+(20x7)=700+140=840

(100x7)+(20x7)=7(100+20)=7·120=840

(80x5)–(30x5)=400-150=250

(80x5)–(30x5)=5(80-30)=5·50=250