giúp  mik với

rut gọn ak

\(\frac{5.18-10.27+15.36}{10.36-20.54+30.72}\)

\(=\frac{5.18-5.2.27+5.3.36}{10.36-10.2.54+10.3.72}\)

\(=\frac{5.18-5.54+5.108}{10.36-10.108+10.216}\)

\(=\frac{5.\left(18-54+108\right)}{10.\left(36-108+216\right)}\)

\(=\frac{5.72}{10.144}\)

\(=\frac{1.1}{2.2}\)

\(=\frac{1}{4}\)

Học tốt ❤⚽

\(=\frac{90-90.3+90.6}{90.4-90.12+90.24}=\frac{90.\left(1-3+6\right)}{90\left(4-12+24\right)}=\frac{4}{16}=\frac{1}{4}\)

\(\frac{5.18-10.27+15.36}{10.36-20.54+30.72}\)

\(=\frac{5.18-10.27+15.36}{5.2.18.2-10.2.27.2+15.2.36.2}\)

\(=\frac{5.18-10.27+15.36}{5.8.2.2-10.27.2.2+15.36.2.2}\)

\(=\frac{1}{2.2-2.2+2.2}\)

\(=\frac{1}{2.2}=\frac{1}{4}\)

Giúp mik với

trước 5h nha

a) \(\frac{120-\left(-0,5\right).\left(-40\right).\left(-5\right).\left(-0,2\right).20.0,25}{5+10+15+...+1995}\)

\(=\frac{120-\left[\left(-0,5\right).\left(-0,2\right)\right].\left[\left(-40\right).0,25\right].\left[\left(-5\right).\left(20\right)\right]}{\left(1995+5\right).\left[\left(1995-5\right)\div5+1\right]\div2}\)

\(=\frac{120-0,1.\left(-10\right).\left(-100\right)}{2000.399\div2}\)

\(=\frac{120-100}{1000.399}\)

\(=\frac{1}{19950}\)

b) \(\frac{5.18-10.27+15.36}{10.36-20.54+30.72}\)

\(=\frac{5.18-2.5.27+3.5.36}{10.2.18-20.2.27+5.2.3.2.36}\)

\(=\frac{5.18-2.5.27+3.5.36}{20.18-20.2.27+20.3.36}\)

\(=\frac{5.\left(18-2.27+3.36\right)}{20.\left(18-2.27+3.36\right)}\)

\(=\frac{1}{4}\)

c) \(\left(\frac{1}{2}-1\right)\left(\frac{1}{3}-1\right)\left(\frac{1}{4}-1\right)...\left(\frac{1}{1999}-1\right)\)

\(=\left(\frac{-1}{2}\right).\left(\frac{-2}{3}\right).\left(\frac{-3}{4}\right)...\left(\frac{-1998}{1999}\right)\)

\(=\frac{\left(-1\right).\left(-2\right).\left(-3\right)...\left(-1998\right)}{2.3.4...1999}\)

\(=\frac{\left(-1\right).\left(-1\right).\left(-1\right)...\left(-1\right)}{1.1.1...1999}\)

Ta có : 1998 số (-1) mà 1998 là số chẵn

Vậy tích của 1998 số (-1) = 1

\(\Rightarrow\frac{\left(-1\right).\left(-1\right).\left(-1\right)...\left(-1\right)}{1.1.1...1999}\)

\(=\frac{1}{1999}\)

Gọi kết quả của phép tính là A

=> \(\dfrac{4}{7.25}\) + \(\dfrac{5}{25.10}\) + \(\dfrac{6}{10.36}\) + \(\dfrac{9}{36.15}\) = A

<=> \(\dfrac{4}{175}\) + \(\dfrac{5}{250}\) + \(\dfrac{6}{360}\) + \(\dfrac{9}{540}\) = A

<=> (\(\dfrac{4}{175}\) + \(\dfrac{1}{50}\)) + (\(\dfrac{1}{60}\) + \(\dfrac{1}{60}\)) = A

<=> (\(\dfrac{200}{8750}\) + \(\dfrac{175}{8750}\)) + \(\dfrac{2}{60}\) = A

<=> \(\dfrac{375}{8750}\) + \(\dfrac{1}{30}\) = A

<=> \(\dfrac{3}{70}\) + \(\dfrac{1}{30}\) = A

<=> \(\dfrac{90}{2100}\) + \(\dfrac{70}{2100}\) = A

<=> \(\dfrac{160}{2100}\)

Lỡ gửi trả lời còn nữa nè :

<=> \(\dfrac{160}{2100}\) = A

<=> A = \(\dfrac{8}{105}\)

Vậy tổng của biểu thức là \(\dfrac{8}{105}\)

15,56 + 14,41 = 29,97

4,25 - 0.12 = 4,13

15.36 x 12.25 = 188,16

15.56 + 14.41 = 29.97

4.25 - 0.12= 4.13

15.36 x 12.25 = 188.16

tick nha

15,56 + 14,41 = 29,97

4,25 - 0.12 = 4,23

15,36 x 12,25 = 188,16

tick cho minh nha moi nguoi