Question

иследуйте способ быстрого вычисления
1) 45+19=64
45+20-1=65-1
2) 69+24
3) 27+59
4) 52+39
5) 29+16

2)37+18=55
37+20-2=57
2) 46+28
3) 38+54
4) 27+18
5) 48+33

Answer 1

2. 70-1+24=46-1=45

3. 27+60-1=87-1=86

4. 52+40-1=92-1=91

5. 30-1+16=46-1=45

2. 46+30-2=76-2=74

3. 40-2+54=94-2=92

4. 27+20-2=47-2=45

5. 50-2+33=83-2=81

Answer 2

2. 70-1+24=46-1=45

3. 27+60-1=87-1=86

4. 52+40-1=92-1=91

5. 30-1+16=46-1=45

2. 46+30-2=76-2=74

3. 40-2+54=94-2=92

4. 27+20-2=47-2=45

5. 50-2+33=83-2=81