Bài 1:Thực hiện phép tính a,8/5:14/-5+8/14 b,(1/3+1/4-1/5):23/5 c,4/5+ -12/25
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sẵn tiện giúp em luôn nha :
( -17)+ 14+ (-12)
5 mũ 10 : 5 mũ 8 +60 : 12+(-10)
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a) (-124) + 24 = -100
b) 37. 78 + 37. 22
= 37 . ( 78 + 22 )
= 37 . 100
= 3700
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a: \(3\cdot5^2-16:2^2\)
\(=75-4\)
=71
b: \(15\cdot141+59\cdot15=15\cdot200=3000\)
c: \(2^3\cdot17-2^3\cdot14=2^3\cdot3=24\)
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1: \(3\cdot5^2-16:2^2\)
\(=3\cdot25-16:4\)
=75-4
=71
3: \(2^3\cdot17-2^3\cdot14\)
\(=2^3\left(17-14\right)\)
\(=8\cdot3=24\)
5: \(20-\left[30-\left(5-1\right)^2\right]\)
\(=20-\left[30-4^2\right]\)
\(=20-\left[30-16\right]\)
\(=20-14=6\)
7: \(8\cdot5^2-189:3^2\)
\(=8\cdot25-189:9\)
=200-21
=179
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e: =5/7(5/11+2/11-14/11)
=5/7(-7/11)=-5/11
f: =-5/4(2/11+9/11)+1+3/4
=-5/4+7/4
=2/4=1/2
g: =-5/7(3/13+10/13)+1+5/7
=-5/7+1+5/7
=1
h: =7/4(29/5-9/5)+41/13
=-7+41/13=-50/13
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Bài 1:
$0,2-\frac{4}{7}+\frac{-6}{5}=\frac{1}{5}+\frac{-6}{5}-\frac{4}{7}$
$=\frac{-5}{5}-\frac{4}{7}=-1-\frac{4}{7}=\frac{-11}{7}$
b.
$=(\frac{-2}{3})^2+\frac{5}{6}+(-1)=\frac{4}{9}+\frac{5}{6}-1$
$=\frac{8}{18}+\frac{15}{18}-1=\frac{23}{18}-1=\frac{5}{18}$
c.
$=1+3+5+7+9=25$
Bài 2:
a. $-(0,5+x)-\frac{1}{3}=\frac{1}{6}$
$-(0,5+x)=\frac{1}{3}+\frac{1}{6}=\frac{1}{2}$
$0,5+x=\frac{-1}{2}$
$x=\frac{-1}{2}-0,5=-1$
b.
$(x+\frac{4}{9})(x-\frac{11}{5})=0$
$\Rightarrow x+\frac{4}{9}=0$ hoặc $x-\frac{11}{5}=0$
$\Rightarrow x=\frac{-4}{9}$ hoặc $x=\frac{11}{5}$
c.
$\frac{1}{3}-|\frac{5}{4}-2x|=\frac{1}{4}$
$|\frac{5}{4}-2x|=\frac{1}{3}-\frac{1}{4}=\frac{1}{12}$
$\Rightarrow \frac{5}{4}-2x=\frac{1}{12}$ hoặc $\frac{5}{4}-2x=\frac{-1}{12}$
$\Rightarrow x=\frac{1}{2}(\frac{5}{4}-\frac{1}{12})$ hoặc $x=\frac{1}{2}(\frac{5}{4}+\frac{1}{12})$
$\Rightarrow x=\frac{7}{12}$ hoặc $x=\frac{2}{3}$