\(B=tan^267^0-cot^223^0+2\cdot\left(sin^216^0+cos^216^0\right)-2\)

\(=0+2\cdot1-2=0\)

\(A=cot67\cdot tan67-2\left(\dfrac{\sqrt{2}}{2}\cdot sin64\right)^2-2\cdot\dfrac{sin23}{3\cdot sin23}-sin^226^0\)

\(=1-2\cdot\dfrac{1}{2}\cdot sin^264^0-\dfrac{2}{3}-sin^226^0\)

\(=1-1-\dfrac{2}{3}=-\dfrac{2}{3}\)

256,23 + 12,56 = 268,79

56,23 + 12,45 = 68,68

89,67 - 23,45 = 66,22

1,23 + 34,67 = 35,9

19,56 + 45,65 = 65,21

kp voi : http://olm/thanhvien/gop123 va mih dj

28(29-23) - 29(28-23)

= 812-644-812+667

= 23

(-167).(67-34)-67.(34-167)

= -11189+5678-2278+11189

= 3400

28(29-23) - 29(28-23)

= 812-644-812+667

= 23

(-167).(67-34)-67.(34-167)

= -11189+5678-2278+11189

= 3400

28(29-23) - 29(28-23)

= 812-644-812+667

= 23

(-167).(67-34)-67.(34-167)

= -11189+5678-2278+11189

= 3400

đây nha 

tick cho mk nha

=79

=90

\(67+12=79\)

\(67+23=90\)

hok tốt

67 + 12 = 79

67 + 23 = 90

a)

=67.(36+65-1)

=67.100

=6700

b)

=[7²³.(45+4)]:7²⁵

=[7²³.    49   ]:7²⁵

=[7²³.    7²   ]:7²⁵

=7²⁵     :7²⁵

=1

a) 67.36 + 67.65 - 67 = 67.\(\left(36+65-1\right)\) = 67. 100 = 6700

b) \(\left(7^{23}.45+7^{23}.4\right):7^{25}\) = \(7^{23}.\left(45+4\right):7^{25}=7^{23}.7^2:7^{25}=1\)

23 x 67 +23 x 24 -23 = 23 x \(\left(67+34-1\right)\)=23x 100 = 2300

đúng nhé

mình chán tính nhanh lắm rùi bạn lấy máy tính casio bấm cho nhanh

23+45+34+67+89+14+67+69+34=442

23+45+34+67+89+14+67+69+34=442

442 nha

23 + 67 = 90

23 + 78 = 101

90

101

nhé

23 + 67 = 90

23 + 78 =101

Ủng hộ nha !

\(a\frac{31}{23}-\left(\frac{7}{23}+\frac{8}{23}\right)\)

\(=\frac{31}{23}-\frac{7}{23}-\frac{8}{23}\)

\(=\frac{16}{23}\)

Hot

tốt

!

a)\(\frac{31}{23}-\left(\frac{7}{23}+\frac{8}{23}\right)=\frac{31}{23}-\frac{8}{23}+\frac{7}{23}=1+\frac{7}{23}=1\frac{7}{23}\)

b)\(\left(\frac{1}{3}+\frac{12}{67}+\frac{13}{41}\right)-\left(\frac{79}{67}-\frac{28}{41}\right)=\left(\frac{13}{41}+\frac{28}{41}\right)+\left(\frac{79}{67}-\frac{12}{67}\right)-\frac{1}{3}=1+1-\frac{1}{3}\)

\(=2-\frac{1}{3}=\frac{5}{3}\)