\(A=\dfrac{102\cdot101}{2}=51\cdot101=5151\)
\(A=\dfrac{102\cdot101}{2}=51\cdot101=5151\)
A=101+100+99+98+...+3+2+1/101-100+99-98+...+3-2+1
A] 101-100+99-98+.......+3-2+1
B] 101+100+99+98+.......+3+2+1
tính
a. A= 101+100+99+98+....+3+2+1/101-100+99-98+...+3-2+1
b,B= 3737.43-4343.37/2+4+6+...+100
A=101+100+99+98+....+3+2+1/101-100+99-98+...+3-2+1
B=423134.846267-423133/423133.846267+423134
A=101+100+98+97+...+3+2+1/101-100+99-98+...+3-2+1
tính
\(A=\frac{101+100+99+.....+3+2+1}{101-100+99-98+......+3-2+1}\)
\(A =\)\(\dfrac{101+100+99+98+...+3+2+1}{101-100+99-98+...+3-2+1}\)
\(B=\) \(\dfrac{3737.43-4343.37}{2+4+6+...+100}\)
Làm cách lớp 6 thôi ah
Tính:
a; C=101+100+99+98+............+3+2+1/101-100+99-98+.................+3-2+1
b; D=3737.43-443.37/2+4+6+....................+100
S=1×2+2×3+3×4+4×5+...........+99×100
3S=1×2×3+2×3×(4-1)+3×4×(5-2)+4×5×(6-3)+............+99×100×(101-98)
3S=1×2×3+2×3×4-1×2×3+3×4×5-2×3×4+4×5×6-3×4×5+.............+99×100×101-98×99×100
3S=99×100×101
Tại sao 3S=99×100×101
Các bạn giải thích hộ mình với!
MÌNH CẢM ƠN MỌI NGƯỜI!
a. A= (101+100+99+98+97+....+3+2+1) : (101-100+99-98+....+3-2+1)
b, B=(3737.43 -4343.37) : (2+4+6+....+100)