Làm hộ câu c và d thui nhé
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\(b,=\left|\dfrac{17}{6}-\dfrac{35}{6}\right|+1=3+1=4\\ c,=\dfrac{7^3\left(7^2-4\right)}{45}=\dfrac{7^3\cdot45}{45}=7^3=343\)
a: \(7+\left(\dfrac{7}{12}-\dfrac{1}{2}+3\right)-\left(\dfrac{1}{12}+5\right)\)
\(=7+\dfrac{7}{12}-\dfrac{1}{12}-\dfrac{1}{2}+3-5\)
\(=7+1-2\)
=6
c) \(1-\left\{1:\left[2^3+1-\left(-\dfrac{1}{2}\right)^2\right]\right\}\)\(=1-\left[1:\left(8+1-\dfrac{1}{4}\right)\right]=1-\left(1:\dfrac{35}{4}\right)=1-\dfrac{4}{35}\)\(=\dfrac{35-4}{35}=\dfrac{31}{35}\)
Với `x >= 0,x \ne 1` có:
`C=A/B=A:B=[\sqrt{x}+1]/[x+\sqrt{x}+1]:(\sqrt{x}/[x\sqrt{x}-1]+1/[\sqrt{x}-1])`
`C=[\sqrt{x}+1]/[x+\sqrt{x}+1]:[\sqrt{x}+x+\sqrt{x}+1]/[(\sqrt{x}-1)(x+\sqrt{x}+1)]`
`C=[\sqrt{x}+1]/[x+\sqrt{x}+1].[(\sqrt{x}-1)(x+\sqrt{x}+1)]/[x+2\sqrt{x}+1]`
`C=[\sqrt{x}+1]/[x+\sqrt{x}+1].[(\sqrt{x}-1)(x+\sqrt{x}+1)]/[(\sqrt{x}+1)^2]`
`C=[\sqrt{x}-1]/[\sqrt{x}+1]`
1.Thế \(x=4\) vào A, ta được:
\(A=\dfrac{\sqrt{4}+1}{4+\sqrt{4}+1}=\dfrac{2+1}{4+2+1}=\dfrac{3}{7}\)
2.
\(B=\dfrac{\sqrt{x}}{x\sqrt{x}-1}+\dfrac{1}{\sqrt{x}-1}\)
\(B=\dfrac{\sqrt{x}}{\sqrt{x}^3-1}+\dfrac{1}{\sqrt{x}-1}\)
\(B=\dfrac{\sqrt{x}}{\left(\sqrt{x}-1\right)\left(x+\sqrt{x}+1\right)}+\dfrac{1}{\sqrt{x}-1}\)
\(B=\dfrac{\sqrt{x}+\left(x+\sqrt{x}+1\right)}{\left(\sqrt{x}-1\right)\left(x+\sqrt{x}+1\right)}\)
\(B=\dfrac{x+2\sqrt{x}+1}{\left(\sqrt{x}-1\right)\left(x+\sqrt{x}+1\right)}\)
\(B=\dfrac{\left(\sqrt{x}+1\right)^2}{\left(\sqrt{x}-1\right)\left(x+\sqrt{x}+1\right)}\)
\(C=\dfrac{A}{B}\)
\(C=\dfrac{\sqrt{x}+1}{x+\sqrt{x}+1}:\dfrac{\left(\sqrt{x}+1\right)^2}{\left(\sqrt{x}-1\right)\left(x+\sqrt{x}+1\right)}\)
\(C=\dfrac{\sqrt{x}+1}{x+\sqrt{x}+1}.\dfrac{\left(\sqrt{x}-1\right)\left(x+\sqrt{x}+1\right)}{\left(\sqrt{x}+1\right)^2}\)
\(C=\dfrac{\sqrt{x}-1}{\sqrt{x}+1}\)
a: Ta có: \(\widehat{xBC}=\widehat{ABM}\)
mà \(\widehat{ABM}=\widehat{NMB}\)
nên \(\widehat{xBC}=\widehat{BMN}\)
c) What does your sister do in the morning ?
e) What did he do last Sunday ?
c: \(37-2\cdot1^{11}+3\cdot5\cdot5^2\)
\(=37-2+15\cdot5^2\)
=35+375
=410
\(c,=37-2.1+3.5^3=37-2+3.125=35-375=-340\\ d,=2^5+2\left[12+2.\left(3.3^2+1\right)\right]=2^5+2\left(12+2.10\right)=2^5+2.32=32+64=96\)tik mik nha