x - 19998 = 20255
tìm x biết:
x+9999+6666=19998
x+16665=19998
\(\Rightarrow\)x=19998-16665=3333
B=(19998:18-14443:13)x(1/3- 1/5+1/7-1/9+1/11)+2019
bạn có thể giải ra giúp mk k
\(B=\left(\frac{19998}{18}-\frac{14443}{13}\right)\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{7}-\frac{1}{9}+\frac{1}{11}\right)+2019\)
\(B=\left(101\cdot\frac{198}{18}-101\cdot\frac{143}{13}\right)\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{7}-\frac{1}{9}+\frac{1}{11}\right)+2019\)
\(B=\left[101\cdot\left(\frac{198}{18}-\frac{143}{13}\right)\right]\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{7}-\frac{1}{9}+\frac{1}{11}\right)+2019\)
\(B=101\cdot0\cdot\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{7}-\frac{1}{9}+\frac{1}{11}\right)+2019\)
\(B=0+2019=2019\)
19998:123=?
19998 : 123 = 162,5853
ai tk mik mik tk lại, please
THANK YOU SO MUCH
theo như kết quả mình tính thì
19998:123=1.625.853.659
6+16+30+48+...+19600+19998
6+16+30+48+....+19600+19998
Tính nHANH:
56785 -19998
56785 -19998
=56785-(20000-2)
=56785-20000+2
=36785+2
=36787
A=6+16+30+48+...+19600+19998
(19998*13-14443*18)*(1+2+.....+2008)
\(=\left(1+2+...+2008\right)\cdot\left(2\cdot3^2\cdot11\cdot13\cdot101-2\cdot3^2\cdot11\cdot13\cdot101\right)=0\)
D= 6+16+30+48+....+19600+19998