Simple operation of 48 × 49 + 48
48*(49+1)=48*50=2400 .
How to calculate 50-49 + 48-47 +, + 2-1
50-49+48-47+,+2-1
=1+1+.+1
=25*1
=25
Simple calculation: 2 ^ 50 + 2 ^ 49 + 2 ^ 48 + +2+1
Urgent request (please use the knowledge of grade one to answer, don't use the formula)
Let s = 2 ^ 50 + 2 ^ 49 + 2 ^ 48 + +2+1
2s=2^51+2^49+2^48+…… +2
S=2S-S=2^51-1
How to calculate 199 times 49 plus 199 times 50 plus 199?
199 times 49 plus 199 times 50 plus 199
=188×(49+50+1)
=199×100
=19900