\(\dfrac{7,8\times1,001\times0,625}{18,2\times0,26\times0,125}\)

\(=\dfrac{3,9\times2\times1,001\times5\times0,125}{18,2\times2\times0,13\times0,125}\)

\(=\dfrac{3,9\times10,01\times0,125}{36,4\times0,13\times0,125}\)

\(=\dfrac{3,9\times77}{36,4}\)

\(=\dfrac{33}{4}\).

YEN NHI mik có thể gạch phần trùng nhau được ko

\(\frac{7,8\times1,001\times0,625}{18,2\times0,26\times0,125}=\frac{30\times0,26\times1,001\times0,125\times5}{18,2\times0,26\times0,125}=\frac{30\times5\times1,001}{18,2}=\frac{150,15}{18,2}=8,25\)

\(\frac{7,8.1,001.0,625}{18,2.0,26.0,125}=\frac{7,8.3,85.0,26.0,125.5}{\frac{7}{3}.7,8.0,26.0,125}=\frac{3,85.5}{\frac{7}{3}}=\frac{\frac{77}{4}}{\frac{7}{3}}=\frac{77}{4}:\frac{7}{3}=\frac{33}{4}=8,25\)

= \(\frac{\left(6\times1,3\right)\times\left(0,13\times7\times1,1\right)\times\left(5\times0,125\right)}{\left(14\times1,3\right)\times\left(2\times0,13\right)\times0,125}=\frac{\left(6\times7\times1,1\times5\right)\times\left(1,3\times0,13\times0,125\right)}{\left(14\times2\right)\times\left(1,3\times0,13\times0,125\right)}\)

= \(\frac{14\times3\times1,1\times5}{14\times2}=\frac{16,5}{2}=\frac{33}{4}\)

4,5x19,375x0,4=34,875

3,125x1,2x1,5x6,2=34,875

Chúc em học tốt!

mink lm đc câu D thôi

D=1/2+1/4+1/8+...+1/256

D=1-1/2+1/2-1/4+1/4-1/8+1/8-1/16+....+1/128-1/256

D=1-1/256

D=255/256

= 124,5456

trả lời

4,5*19,375*0,4/3.125*1,2*1,5*6,2=124,5456

chúc bn 

hc tốt

124,5456

a: \(\dfrac{40.2\cdot8.1\cdot4.8}{0.048\cdot0.81}=40.2\cdot\dfrac{8.1}{0.81}\cdot\dfrac{4.8}{0.048}\)

\(=40.2\cdot10\cdot100=402\cdot100=40200\)

b: \(\dfrac{45\cdot16-17}{45\cdot15+28}=\dfrac{720-17}{675+28}=\dfrac{703}{703}=1\)

\(\frac{40,8\times8,1\times48}{0,048\times0,81}=\frac{40,8\times10000\times0,81\times0,048}{0,048\times0,81}=\frac{40,8\times10000}{1}=\frac{408000}{1}=408000\)

408000 nha                                                               chúc bạn học giỏi