Question

8. Calculati in două moduri: • 23 (485 - 392) = • 38 x (493+ 128) = . 47 x 12 + 47 x 13= 430 x 39-28 430 =​

Answer 1

Răspuns:

23x(485-392)=23×93=2139

23×(485-392)=23×485-23×392=2139

38×(493+128)=38×621=23598

38×(493+128)=38×493+128×38=23598

47×12+47×13=564+611=1175

47×(12+13)=47×25=1175

430×39-28×430=16770-12040=4300

430×(39-28)=430×10=4300

cu placere!