Share
Hộ mìk với , cho 20 đ , đc chưa 1×100+2×99+3×98+4×97+…….+97×4+98×3+99×2+100×1 Làm theo cách lớp 6
Question
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Answers ( )
Đáp án:
7.84 x 10^18
Giải thích các bước giải:
1×100+2×99+3×98+4×97+…….+97×4+98×3+99×2+100×1
=100 x ( 1+99) x (2+98) x (3+97) x 4 +…+ 4 x (97+3) x (98+2) x (99+1) x 100
=100x100x100x100x4+…+4x100x100x100x100
=400.000.000.400.000.000.49
=7.84 x 10^18