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s) 6450 + 6540 + 550 - 540
= ( 6450 + 550 ) + ( 6540 - 540 )
= 7000 + 6000
= 13000
b) 25 x 20 x 4 x 5 x 7
= ( 25 x 4 ) x ( 20 x 5 ) x 7
= 100 x 100 x 7
= 10000 x 7
= 70000
c) 44 + 44 x 16 + 44 x 2 - 44 x 9
= 44 x 1 + 44 x 16 + 44 x 2 - 44 x 9
= 44 x ( 1 + 16 + 2 - 9 )
= 44 x 10
= 440
a)
\(6450+6540+550-540\)
\(=\left(6450+550\right)+\left(6540-540\right)\)
\(=7000+6000\)
\(=13000\)
b)
\(25\times20\times4\times5\times7\)
\(=\left(25\times4\right)\times\left(20\times5\right)\times7\)
\(=100\times100\times7\)
\(=10000\times7\)
\(=70000\)
c)
\(44+44\times16+44\times2-44\times9\)
\(=44\times1+44\times16+44\times2-44\times9\)
\(=44\times\left(1+16+2-9\right)\)
\(=44\times10\)
\(=440\)
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=39/16:5/8-7/16:5/8+4/5:5/8
=(39/16-7/16+4/5):5/8
= 14/5:5/8
=112/25
= ( 39/16 + 7/16 ) : 5/8 : 4/5
= 46/16 * 8/5 * 5/4
= 368/80 * 5/4
= 23/4
Chúc bạn học tốt !!!
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3/5 + 3/16 + 13/16
= 3/5 + ( 3/16 + 13/16 )
= 3/5 + 16/16
= 3/5 + 1
= 3/5 + 5/5
= 8/5
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\(=\left(\dfrac{1}{6}+\dfrac{5}{6}\right)+\left(\dfrac{4}{9}+\dfrac{5}{9}\right)+\left(\dfrac{11}{16}+\dfrac{5}{16}\right)=1+1+1=3\)
\(=\left(\dfrac{1}{6}+\dfrac{5}{6}\right)+\left(\dfrac{4}{9}+\dfrac{5}{9}\right)+\left(\dfrac{11}{16}+\dfrac{5}{16}\right)\\ =1+1+1=3\)
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a) \(\frac{13}{19}+\frac{18}{19}+\frac{19}{19}=\left(\frac{13}{19}+\frac{17}{19}\right)+\frac{18}{19}=\frac{20}{19}+\frac{18}{19}=\frac{48}{19}\)
b) \(\frac{3}{5}+\frac{3}{16}+\frac{13}{16}=\left(\frac{3}{16}+\frac{13}{16}\right)+\frac{3}{5}=1+\frac{3}{5}=\frac{5}{5}+\frac{3}{5}=\frac{8}{5}\)
a) \(\frac{13}{19}+\frac{18}{19}+\frac{17}{19}\)
= \(\frac{31}{19}+\frac{17}{19}\)
= \(\frac{48}{19}.\)
b) \(\frac{3}{5}+\frac{3}{16}+\frac{13}{16}\)
= \(\frac{3}{5}+\left(\frac{3}{16}+\frac{13}{16}\right)\)
= \(\frac{3}{5}+\frac{16}{16}\)
= \(\frac{3}{5}+1\)
= \(\frac{3}{5}.\)
Để tính giá trị của biểu thức \(1450 : 5 + 550 : 5 - 16 \times 9 - 16\), ta sẽ thực hiện từng phép toán theo đúng thứ tự ưu tiên.
Vậy, giá trị của biểu thức là \(240\).
\(1450:5+550:5-16\times9-16\)
\(=\left(1450+550\right):5-16\times\left(9+1\right)\)
\(=2000:5-16\times10\)
=400-160
=240