Chọn B

B

\(\dfrac{12,48:0,5\times6,25\times4\times2}{2\times3,12\times1,25:0,25\times10}\)

\(=\dfrac{12,48\times2\times50}{6,24\times1,25\times4\times10}=\dfrac{12.48\times2}{6,24}=4\)

\(9km^26dam^2=90006dam^2\)

\(8m^325dm^3=8,025m^3\)

25% của 60000m là 15000m

45% của 0,4 tấn là 180kg

\(\dfrac{34}{100}=0,34;\dfrac{176}{10}=17,6;13\dfrac{1}{100}=13,01\)

\(4\dfrac{6}{10}=4,6;1\dfrac{2}{5}=1,4;2\dfrac{1}{4}=2,25;4\dfrac{3}{4}=4.75\)

\(\dfrac{12}{5}=2,4;\dfrac{10}{4}=2,5;\dfrac{7}{2}=3,5\)

624,5:14,8=42,19(dư 0,088)

148,1448

936,4-473,82=462,58

462 , 58 nha 

tk

Chọn C

Bạn chọn c nha

a: 3400,26

b: 40207,003

c: 710,032

d: 190000,056

\(\dfrac{6,18:0,25\times3,5\times4:0,125\times5:0,1}{3,09:0,2\times8\times7:50\%\times8\times10}\)

\(=\dfrac{6,18\times4\times3,5\times4\times8\times5\times10}{3,09\times5\times8\times7\times2\times8\times10}\)

\(=\dfrac{6.18}{3.09}\times\dfrac{4\times4\times3,5}{7\times2\times8}=2\times\dfrac{1}{2}=1\)