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a) \(26+150+74=\left(26+74\right)+150=100+150=250\).
b) \(35.46+54.35=35.\left(46+54\right)=35.100=3500\).
c) \(\left(-31\right)+\left[20-\left(7-4\right)^2\right]=\left(-31\right)+20-3^2=\left[\left(-31\right)-9\right]+20=-40+20=-20\)
a,(-87) + (-34) + (-13)
=[(-87) + (-13)] + (-34)
= -100 + (-34)
= -134
b,(-26) + 117 + 1026 + (-17)
=[(-26) + 1026] + [117 + (-17)]
=1000 + 100
=1100
c,142 . 23 + 142 . 17 - 40 . 42
= 142 . (23 + 17) - 40 . 42
= 142 . 40 - 40 . 42
= (142 - 42) . 40
= 100 . 40
= 4000
#họctốt
&YOUTUBER&
a) \(35.26+35.74\)
\(=35\left(26+74\right)\)
\(=35.100\)
\(=3500\)
b) \(6^7:6^5+3.3^2\)
\(=6^2+3^3\)
\(=36+27\)
\(=63\)
31: (-29)+8-9
\(=\left(-29\right)+\left(8-9\right)\)
\(=-29-1=-30\)
32: \(\left(-14\right)-6-10\)
\(=\left(-14-6\right)-10\)
=-20-10
=-30
33: \(\left(-42\right)+10+2\)
\(=\left(-42\right)+\left(10+2\right)\)
=-42+12
=-30
34: \(\left(-45\right)+25-20\)
\(=\left(-45\right)+\left(25-20\right)\)
=-45+5
=-40
35: \(\left(-60\right)+17+3\)
\(=\left(-60\right)+\left(17+3\right)\)
=-60+20
=-40
36: \(\left(-48\right)+18-10\)
\(=\left(-48+18\right)-10\)
=-30-10
=-40
câu d)
\(\dfrac{6}{5}+\left(3+\dfrac{-1}{5}\right)\\ =\dfrac{6}{5}+3+\dfrac{-1}{5}\\ =1+3=4\)
câu e)
\(-\dfrac{3}{5}+\left(-\dfrac{2}{5}+2\right)\\ =\dfrac{-3}{5}+\dfrac{-2}{5}+2\\ =-1+2=1\)
câu f)
\(\dfrac{8}{3}-\left(-\dfrac{4}{3}+3\right)\\ =\dfrac{8}{3}+\dfrac{4}{3}-3\\ =4-3=1\)
Lời giải:
g.
$=\frac{-5}{11}+\frac{-6}{11}+1=(\frac{-5}{11}+\frac{-6}{11})+1$
$=\frac{-11}{11}+1=(-1)+1=0$
h.
$=\frac{-17}{13}+\frac{4}{13}+\frac{25}{101}$
$=\frac{-13}{13}+\frac{25}{101}=(-1)+\frac{25}{101}=-(1-\frac{25}{101})$
$=\frac{-76}{101}$
i.
$=\frac{6}{7}+\frac{1}{8}-\frac{3}{16}.4=\frac{6}{7}+\frac{1}{8}-\frac{3}{4}$
$=\frac{6}{7}+\frac{1}{8}-\frac{6}{8}=\frac{6}{7}+\frac{-5}{8}$
$=\frac{13}{56}$
3 x 52 +15 x 22 -26 : 2
= 156 + 330 -13
= 486 -13
=473