Контрольные задания
Вопрос:Фото задания: 3. Вычисли удобным способом. 40+4+20+5= 90-7-30-2= 30+6+2+50= 80-3-6-40= 50+3+30+4= 70-4-5-20= 20+7+2+60= 60-3-40-4=…Фото задания

Ответ:

Решение:

  1. \( 40+4+20+5 = (40+20)+(4+5) = 60 + 9 = 69 \)
  2. \( 90-7-30-2 = (90-30)-(7+2) = 60 - 9 = 51 \)
  3. \( 30+6+2+50 = (30+50)+(6+2) = 80 + 8 = 88 \)
  4. \( 80-3-6-40 = (80-40)-(3+6) = 40 - 9 = 31 \)
  5. \( 50+3+30+4 = (50+30)+(3+4) = 80 + 7 = 87 \)
  6. \( 70-4-5-20 = (70-20)-(4+5) = 50 - 9 = 41 \)
  7. \( 20+7+2+60 = (20+60)+(7+2) = 80 + 9 = 89 \)
  8. \( 60-3-40-4 = (60-40)-(3+4) = 20 - 7 = 13 \)
  9. \( 30+4+20+1 = (30+20)+(4+1) = 50 + 5 = 55 \)
  10. \( 80-5-30-3 = (80-30)-(5+3) = 50 - 8 = 42 \)

Ответ: 69, 51, 88, 31, 87, 41, 89, 13, 55, 42.