tính : 17 + \-33\= ?
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\(\sqrt{17-\sqrt{33}}\cdot\sqrt{17+\sqrt{33}}\)
\(=\sqrt{\left(17-\sqrt{33}\right)\left(17+\sqrt{33}\right)}\)
\(=\sqrt{17^2-\left(\sqrt{33}\right)^2}\)
\(=\sqrt{289-33}\)
\(=\sqrt{256}\)
\(=\sqrt{16^2}\)
\(=16\)
33.(17 – 5) – 17.(33 -5)
= 33. 17 – 33.5 – 17.33 + 17.5
= (33.17 – 33. 17) + ( 17.5 – 33.5)
= 0 + 5.(17- 33)
= 5.(- 16) = -80
= 33.17 - 33.5 - 17.33 + 17.5
= 17.5 - 33.5
= 5.(17 - 33)
= 5.(-16)
= -80
33.(17 - 5)-17.(33-5)
33.12-17.28
=396-476
= - 80
tk cho mình nha
\(\sqrt{17-\sqrt{33}}\cdot\sqrt{17+\sqrt{33}}\)
\(=\sqrt{17^2-\left(\sqrt{33}\right)^2}\)
\(=\sqrt{289-33}=\sqrt{256}=16\)
\(\frac{5}{17}.\frac{16}{33}+\frac{5}{33}.\frac{20}{17}-\frac{2}{17}.\frac{5}{33}\)
\(=\frac{5}{17}.\frac{16}{33}+\frac{5}{17}.\frac{20}{33}-\frac{5}{17}.\frac{2}{33}\)
\(=\frac{5}{17}.\left(\frac{16}{33}+\frac{20}{33}-\frac{2}{33}\right)\)
\(=\frac{5}{17}.\frac{34}{33}\)
\(=\frac{10}{33}\)
Chúc bạn học tốt !!!
33 x ( 17 - 5 ) - 17 x ( 33 - 5 )
= 33 x 17 - 33 x 5 - 17 x 33 + 17 x 5
= ( 33 x 17 - 33 x 17 ) - 33 x 5 + 17 x 5
= 0 - 5 x ( 33 - 17 )
= -5 x 16
= -80
54 - 6 x ( 17 + 9 )
= 54 - 6 x 17 - 6 x 9
= 54 - 102 - 54
= ( 54 - 54 ) - 102
= 0 - 102 = -102
33.(17-5) - 17. (33-5)
=33.17-33.5-17.33+17.5
=16.5
=90
tick nhé
a)=18.17-18.7
=18.(17-7)=18.10=180
b)=54-(6.17+6.9)=54-102-54=(54-54)-102=0-102=-102
c)=(33.17-33.5)-(17.33-17.5)=33.17-33.5-17.33+17.5=(33.17-17.33)-5.(33-17)=0-80=-80
\(a,18.17-3.6.7\)
\(=18.17-18.7\)
\(=18.\left(17-7\right)\)
\(=18.10\)
\(=180\)
\(b,54-6.\left(17+9\right)\)
\(=54-6.17+6.9\)
\(=54-102+54\)
\(=\left(54+54\right)-102\)
\(=108-102\)
\(=6\)
\(c,33.\left(17-5\right)-17.\left(33-5\right)\)
\(=33.17-33.5-17.33-17.5\)
\(=\left(33.17-17.33\right)-\left[5\left(33-17\right)\right]\)
\(=0-5.16\)
\(=-80\)
ai nhanh,có lời giải phù hợp thì mình OK cho