Выполните умножение (1335,1335). 6,3×7; 8,35×3; 9,6×8; 4,5×12; 8,31×14; 9,5×11; 9,03×17; 9,04×15; 2,15×12; - id509618520220529 от alinamalinavkjkjh 29.05.2022 09:53

Question

Математика: Выполните умножение (1335,1335). 6,3×7; 8,35×3; 9,6×8; 4,5×12; 8,31×14; 9,5×11; 9,03×17; 9,04×15; 2,15×12; друзья аа

alinamalinavkjkjh · Accepted Answer

58-37 = (50 + 8 ) - ( 30 + 7) = ( 50 - 30 ) + ( 8 - 7) = 20 + 1 = 21

72-51 = ( 70 + 2) - ( 50 + 1) = ( 70 - 50) + ( 2 - 1) = 20 + 1 = 21

71-51 = ( 70 + 1) - ( 50 + 1) = ( 70 - 50) + ( 1 - 1) = 20 + 0 = 20

783-541 = ( 700 + 80 + 3) - ( 500 + 40 + 1) = (700 - 500) + (80 - 40) + (3 - 1) =

= 200 + 40 + 2 = 242

837-615 = ( 800 + 30 + 7) - (600 + 10 + 5 ) = ( 800 - 600) + (30 - 10) + ( 7 - 5) =

= 200 + 20 + 2 = 222

855-54 = ( 800 + 50 + 5) - ( 50 + 4) = 800 + ( 50 - 50) + (5 - 4) =

= 800 + 0 + 1 = 801

342-22 = ( 300 + 40 + 2) - ( 20 + 2) = 300 + ( 40 - 20) + ( 2 - 2) =

= 300 + 20 + 0 = 320

2)

346 - 21 = 325 ( уч.) - во второй школе

346 + 325 = 671 ( уч.) - всего

ответ: 671 ученик.

Выполните умножение (1335,1335). 6,3×7; 8,35×3; 9,6×8; 4,5×12; 8,31×14; 9,5×11; 9,03×17; 9,04×15; 2,15×12; друзья аа