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traa loi nhanh cho minh , minh can gap vao dem thu sau ngay 8 thang 11
Bài 1
a)(9+8)x + 16 . 2x = 98
17x + 32x = 98
49x = 98
x = 98 : 49
x = 2
a) \(2^{300}=\left(2^3\right)^{100}=8^{100}\)
\(3^{200}=\left(3^2\right)^{100}=9^{100}\)
vi \(8^{100}< 9^{100}\)nen \(2^{300}< 3^{200}\)
Giải:
\(1\dfrac{13}{15}.\left(0,5\right)^2.3+\left(\dfrac{8}{15}-1\dfrac{19}{60}\right):1\dfrac{23}{24}\)
\(=\dfrac{28}{15}.\dfrac{1}{4}.3+\left(\dfrac{8}{15}-\dfrac{79}{60}\right):\dfrac{47}{24}\)
\(=\dfrac{7}{5}+\left(-\dfrac{47}{60}\right).\dfrac{24}{47}\)
\(=\dfrac{7}{5}+\left(-\dfrac{2}{5}\right)\)
\(=\dfrac{7}{5}-\dfrac{2}{5}\)
\(=1\)
Vậy ...
A = ( -4/5 + 4/3 ) + (-5/4 + 14/5) - 7/3
= 8/15 + 31/20 - 7/3
= 25/12 - 7/3
= -1/4
B = 8/3 x 2/5 x 3/8 x 10x 19/92
= 16/15 x 15/4 x 19/92
= 4x19/92
= 19/23
C = - \(\dfrac{5}{7}\) x \(\dfrac{2}{11}\) + \(\dfrac{-5}{7}\) x \(\dfrac{9}{14}\) + \(\dfrac{1}{57}\)
= - \(\dfrac{10}{77}\) - \(\dfrac{45}{98}\) + \(\dfrac{1}{57}\)
= - \(\dfrac{635}{1078}\) + \(\dfrac{1}{57}\)
= - \(\dfrac{36195}{61446}\) + \(\dfrac{1078}{61446}\)
= - \(\dfrac{35117}{61446}\)
Lam on tra loi minh di
\(1\frac{13}{15}\times\left(-0,5\right)^2\times3+\left(\frac{8}{15}-1\frac{19}{50}\right)\)
\(=\frac{28}{15}\times\frac{1}{4}\times3+\frac{8}{15}-\frac{69}{50}\)
\(=\frac{7}{5}+\frac{8}{15}-\frac{69}{50}\)
\(=\frac{83}{150}\)