\(a,\frac{121.75.130.169}{39.60.11.198}=\frac{11^2.5^2.3.13.2.5.13^2}{13.3.5.2^2.3.11.3^2.2.11}\)\(=\frac{11^2.5^3.3.13^3.2}{13.3^4.5.2^3.11^2}=\frac{5^2.13^2}{3^3.2^2}=\frac{4425}{108}\)

\(b,\frac{1989.1990+3978}{1992.1991-3984}=\frac{1989.1990+1989.2}{1992.1991-1992.2}\)\(=\frac{1989\left(1990+2\right)}{1992\left(1991-2\right)}=\frac{1989.1992}{1992.1989}=\frac{1}{1}=1\)

\(c.\frac{135.350+135.550}{900.100+35.900}=\frac{135\left(350+550\right)}{900\left(100+35\right)}=\)\(\frac{135.900}{900.135}=\frac{1}{1}=1\)

\(d.\frac{243.650-243.350}{600.200+600.43}=\frac{243\left(650-350\right)}{600\left(200+43\right)}\)\(=\frac{243.300}{600.243}=\frac{300}{600}=\frac{1}{2}\)

\(\frac{121500}{121500}=1\)

\(171.4005944\)

=87000 nhaaaaaaaaa

Kết quả của mình là ( xem xong nhớ k dùm )

\(\text{135 . 350 + 135 . 550 : 900 . 100 + 35 . 900 = 87 000}\)

Làm ơn k dùm PLEASE

135.350 + 135.550/900.100 + 35.900=

135. (350+550) / 900. (100+35)=

135.      900    /   900.  135=

135. (900+900) =

135. 1800 = 243 000

sai rồi

\(\frac{121\cdot75\cdot130\cdot169}{39\cdot60\cdot11\cdot198}=\frac{11^2\cdot3\cdot5^2\cdot13\cdot2\cdot5\cdot13^2}{13\cdot3\cdot2^2\cdot3\cdot5\cdot11\cdot2\cdot11\cdot3^2}\)

\(=\frac{11^2\cdot3\cdot5^3\cdot13^3\cdot2}{13\cdot3^4\cdot2^3\cdot5\cdot11^2}=\frac{13\cdot5^2}{3^3\cdot2^2}=\frac{325}{36}\)

P/S:Không bt có đúng ko nx nhưng hướng làm là như vậy

cảm ơn

\(\dfrac{121.75.130.169}{39.60.11.198}=\dfrac{11^2.3.5^2.2.5.13.13^2}{3.13.2^2.3.5.11.2.3^2.11}=\dfrac{2.3.5^3.11^2.13^3}{2^3.3^4.5.11^2.13}=\dfrac{5^2.13^2}{2^2.3^3}=\dfrac{4225}{108}\)

=\(\dfrac{121.75.130.169}{39.60.11.198}\)

=\(\dfrac{25.65.13.13}{13.30.18}\)

=\(\dfrac{5.5.65.13.13}{13.6.5.18}\)

=\(\dfrac{5.65.13}{6.18}\)

=\(\dfrac{65.65}{108}\)

=\(\dfrac{4225}{108}\)

Chúc bạn học tốt !

Ta có: \(\dfrac{121\cdot75\cdot130\cdot169}{39\cdot60\cdot11\cdot198}\)

\(=\dfrac{11^2\cdot15\cdot5\cdot13\cdot10\cdot13^2}{13\cdot3\cdot15\cdot4\cdot11\cdot11\cdot18}\)

\(=\dfrac{5\cdot13^2\cdot10}{3\cdot4\cdot18}=\dfrac{4225}{108}\)

\(\frac{121.75.130.169}{39.60.11.98}\)=\(\frac{199377750}{2522520}\)=\(\frac{46475}{588}\)

\(\frac{121.75.130.196}{39.60.11.198}\)

\(=\frac{11.11.3.5.5.2.5.13.}{3.13.3.2.2.5.11.11.3.3.2}\)

\(=\frac{11^2.3.5^3.2.13}{3^4.13.2^3.5.11^2}\)

\(=\frac{5^2}{3^3.2^2}\)

\(=\frac{25}{27.4}\)

\(=\frac{25}{108}\)