Question

(1.2+2.3+3.4 +...+98.99).x/26950  =12và 6/7 :1,5

Answer 1

x=1 và x=\(\dfrac{4}{7}\)

Answer 2

bạn giải ra hộ mình mk tick cho nhé

Answer 3

Đặt (1.2+2.3+3.4+..+98.99)=a

=>3a= 1.2.(3-0)+2.3.(4-1).....98.99.(100-97)

=>3a=1.2.3-0+2.3.4-1.2.3+...+98.99.100-97.98.99

=>3a=98.99.100

=>a-98.99.100/3=323400

Thay vào,ta được

323400.x/26950=12

=>323400.x=12.26950=323400

=>x=1

6/7:1.5=4/7

 

Answer 4

\(\left(1.2+2.3+3.4+...98.99\right).x:26950=12\)

\(\Rightarrow\left(\dfrac{98.99.100}{3}\right).x=12.26950\)

\(\Rightarrow98.33.100.x=12.26950\)

\(\Rightarrow x=\dfrac{12.26950}{98.33.100}=\dfrac{1100}{11.100}=1\)

\(\dfrac{6}{7}:1,5=\dfrac{6}{7}:\dfrac{3}{2}=\dfrac{6}{7}.\dfrac{2}{3}=\dfrac{4}{7}\)