6. 99+1, 40-1, 80-30, 40+60, 10+8, 26-6, 9+70, 86-80, 30+7-1, 37-30+3.

Решение примеров:

• \( 99 + 1 = 100 \)
• \( 40 - 1 = 39 \)
• \( 80 - 30 = 50 \)
• \( 40 + 60 = 100 \)
• \( 10 + 8 = 18 \)
• \( 26 - 6 = 20 \)
• \( 9 + 70 = 79 \)
• \( 86 - 80 = 6 \)
• \( 30 + 7 - 1 = 36 \)
• \( 37 - 30 + 3 = 10 \)