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tử số : 8,1/0,6*1875+1,5*6,25*9=13,5*1875+13,5*6,25=13,5*/(1875+6,25)=13,5*1881,25=25396,875
mẫu số : 105+205+795+895=1(105+895)+(205+795)=1000+1000=2000
25396,875/2000=12,6984375
đs (theo máy tính)
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Câu b:
\(\frac{21}{8}:\frac{5}{6}+\frac{1}{2}:\frac{5}{6}\)
= \(\frac{63}{20}+\frac{3}{5}\)
= \(\frac{15}{4}\)
\(\left(\frac{21}{8}+\frac{1}{2}\right):\frac{5}{6}\)
\(\frac{25}{8}:\frac{5}{6}\)
\(\frac{25}{8}.\frac{6}{5}\)
\(\frac{30}{8}\)
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(2,7+1,8)*2*1,5=4,5*2*1,5 =9*1,5 =13,5 (6/5*3/4)*2*2/3=9/10*2*2/3 =9/5*2/3 =6/5 2,7*1,8*1,5=7,29 6/5*3/4*2/3=3/5 16*16*6=1536
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= 1,8 x 34,5 + 1,8 x 3 x 10,5 + 1,8 x 34
= 1,8 x ( 34,5 + 31,5 + 34)
= 1,8 x 100
= 180
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\(\left(2,7+1,8\right).2.1,5=13,5\)
\(\left(\frac{6}{5}.\frac{3}{4}\right).2.\frac{2}{3}=1,2\)
\(2,7.1,8.1,5=7,29\)
\(\frac{6}{5}.\frac{3}{4}.\frac{2}{3}=0,6\)
\(16.16.6=1536\)
= 13,5.
= \(\frac{6}{5}\).
= 7,29.
= \(\frac{3}{5}\).
= 1536.
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Ai tk cho mình mình tk lại.
0,6 x 720 x 9 + 40 x 2,7 x 5 + 5,4 x 180
= (0,6 x 9) x 720 + (20 x 5) x (2 x 2,7) + 5,4 x 180
= 5,4 x 720 + 100 x 5,4 + 5,4 x 180
= 5,4 x (720 + 100 + 180)
= 5,4 x (820 + 180)
= 5,4 x 1000
= 5400
\(0,6\times720\times9+40\times2,7\times5+5,4\times180\)
\(=720\times5,4+20\times2\times2,7\times5+5,4\times180\)
\(=720\times5,4+100\times5,4+5,4\times180\)
\(=5,4\times\left(720+100+180\right)\)
\(=5,4\times1000\)
\(=5400\)