Question

So Sánh

\(A=\frac{1.2+2.4+3.6+4.8+5.10}{3.4+6.8+9.12+12.16+15.20}\)

và \(B=\frac{111111}{666666}\)

Answer 1

Ta có A=\(\frac{1.2+2.4+3.6+4.8+5.10}{3.4+6.8+9.12+12.16+15.20}\)

            =\(\frac{1.2+2.2.2+3.3.2+4.4.2+5.5.2}{3.4+3.2.4.2+3.3.4.3+3.4.4.4+3.5.4.5}\)

            =\(\frac{2.\left(4+9+16+25\right)}{3.4.\left(4+9+16+25\right)}\)

            =\(\frac{2}{3.4}=\frac{1}{3.2}=\frac{1}{6}\)

           B=\(\frac{111111}{666666}=\frac{1}{6}\)

=>A=B

l-ike mình nha

Answer 2

\(A=\frac{1\cdot2+2\cdot4+3\cdot6+4\cdot8+5\cdot10}{3\cdot2\left(1\cdot2+2\cdot4+3\cdot6+4\cdot8+5\cdot10\right)}=\frac{1}{6}\)

\(B=\frac{111111}{666666}=\frac{1\cdot111111}{6\cdot111111}=\frac{1}{6}\)

Vì 1/6 =1/6 nên A=B

Answer 3

A=B

Answer 4

\(A=B\)

Answer 5

ko bít làm

Answer 6

Cíu khó thế