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\(B=\left(8-2,25+\dfrac{2}{7}\right)-\left(-6-\dfrac{3}{7}+1\dfrac{1}{4}\right)-\left(3+0,5-1\dfrac{2}{7}\right)\\ B=8-\dfrac{9}{4}+\dfrac{2}{7}+6+\dfrac{3}{7}-\dfrac{5}{4}-3-\dfrac{1}{2}+\dfrac{9}{7}\\ B=\left(8+6-3\right)+\left(-\dfrac{9}{4}-\dfrac{5}{4}\right)+\left(\dfrac{2}{7}+\dfrac{3}{7}+\dfrac{9}{7}\right)-\dfrac{1}{2}\)
\(B=11-\dfrac{7}{2}+2-\dfrac{1}{2}\\ B=\left(11+2\right)+\left(-\dfrac{7}{2}-\dfrac{1}{2}\right)\\ B=13-4\\ B=9.\)
\(\left[-\sqrt{2,25}+4\sqrt{\left(-2,15\right)^2}-\left(3\sqrt{\dfrac{7}{6}}\right)^2\right]\sqrt{1\dfrac{9}{16}}\)
\(=\left[-1,5+4\sqrt{2,15^2}-9\cdot\dfrac{7}{6}\right]\sqrt{\dfrac{25}{16}}\)
\(=\left[4\cdot\dfrac{43}{20}-10,5-1,5\right]\cdot\dfrac{5}{4}\)
\(=\left[\dfrac{43}{5}-12\right]\cdot\dfrac{5}{4}\)
\(=\dfrac{43}{5}\cdot\dfrac{5}{4}-12\cdot\dfrac{5}{4}\)
\(=\dfrac{43}{4}-15=\dfrac{-17}{4}\)
(3/4).y = -2,25
y = -2,25 : (3/4)
y = -2,25 : 0,75
y = -3
Và (3/4) + y = -2,25
y = -2,25 - (3/4)
y = -2,25 - 0,75
y = -3
11:
a: Số cần tìm là 3;2;1;0
b: 0
10:
\(2\dfrac{1}{2}=2.5>2.25\)
\(6>5\)
nên căn 6>căn 5
-căn 5<0
0<căn 5
=>-căn 5<căn 5
a) \(\left(\frac{1}{3}.x\right):\frac{2}{3}=\frac{7}{4}:\frac{2}{5}\)
\(\left(\frac{1}{3}.x\right):\frac{2}{3}=\frac{35}{8}\)
\(\Rightarrow\frac{1}{3}.x=\frac{35}{8}.\frac{2}{3}\)
\(\Rightarrow\frac{1}{3}.x=\frac{35}{12}\)
\(\Rightarrow x=\frac{35}{12}:\frac{1}{3}\)
\(\Rightarrow x=\frac{35}{4}\)
Vậy \(x=\frac{35}{4}\)
4,5:0,3=2,25:0,1x
15=2,25 : 0,1x
2,25 :15 =0,1x
0,15 =0,1x
=> 0,15:0,1
x= 1,5
\(=-\dfrac{3}{4}+3-\dfrac{1}{4}-\dfrac{9}{4}+\dfrac{9}{2}=-\dfrac{13}{4}+3+\dfrac{9}{2}=\dfrac{17}{4}\)
\(-\dfrac{3}{4}+\left(3-\dfrac{1}{4}\right)-\left(2,25-\dfrac{9}{2}\right)\)
= \(-1+3-\left(\dfrac{9}{4}-\dfrac{9}{2}\right)\)
= \(2+\dfrac{9}{4}=\dfrac{17}{4}\)
\(-2,25-\dfrac{10}{7}\)
\(=\dfrac{-9}{4}-\dfrac{10}{7}\)
\(=\dfrac{-63}{28}-\dfrac{40}{28}\)
\(=\dfrac{-103}{28}\)
=-9/4-10/7
=-(63/28+40/28)
=-103/28