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Ta có
\(27-\left[20-\left(36-30^2\right)\right]=27-\left(20-6^2\right)=27-\left(20-36\right)\)
\(27-\left(-16\right)=27+16=43\)
b)\(119+\left(-213\right)+212+\left(-118\right)+2012=\left[119+\left(-118\right)\right]+\left[213+\left(-212\right)\right]+2012\)\(1+\left(-1\right)+2012=2012\)
Tick nha nguyen hoang le thi
119+(-213)+212+(-118)+2012=(-94)+212+(-118)+2012=118+(-118)+2012=0+2012=2012
a/ A= 119+(-213)+212+(-118)+2009
A= ! - 1 + 2009
A= 2009
b/ B=223+132+187-23-32-87
B = 200 + 100 + 100
B = 400
c/ C= -2012+(-596)+(-201)+496+301
C = -2012 - 100 + 100
C = -2012
d/ D= -329+(15-101)-(25-440)
D = 0
hok tốt!!!
\(a,A=119+\left(-213\right)+212+\left(-118\right)+2009\)
\(A=\left(119+212+2009\right)+\left[\left(-213\right)+\left(-118\right)\right]\)
\(A=2340+\left(-331\right)\)
\(A=2009\)
\(b,B=223+132+187-23-32-87\)
\(B=\left(223+132+187\right)+\left(-23-32-87\right)\)
\(B=542-142\)
\(B=400\)
b: \(=15\left(141+19\right)=15\cdot160=24000\)
c: \(=2^3\cdot\left(17-14\right)=8\cdot3=24\)
M = 119 - 213 + 212 - 118 + 2009
= ( 119 - 118 ) - ( 213 - 212 ) + 2009
= 1 - 1 + 2009
= 2009
Giải
Bài 1
\(1,a,-40-37-\left(-29\right)\\ =-40-37+29\\ =-77+29=-48\\ b,27+\left(-36\right)-\left(-45\right)=27-36+45\\ =-9+45\\ =36\\ c,-125-\left[\left(-18\right)-125\right]\\ =-125+18+125\\ =\left(-125+125\right)+18\\ =18\\ d,140+\left[\left(-184\right)-140\right]\\ =140-184-140\\ =\left(140-140\right)-184\\ =0-184\\ =-184\)
Bài 2
\(a,x-\left(-15\right)=-8\\ =>x+15=-8\\ =>x=-8-15\\ =>x=-23\\ b,-40-x=-35\\ =>x=\left(-40\right)-\left(-35\right)\\ =>x=-40+35\\ =>x=-5\\ c,x+\left(-50\right)=-27\\ =>x-50=-27\\ =>x=-27+50\\ =>x=23\)
1, Thực hiện phép tính:
\(a,-40+\left(-37\right)-\left(-29\right)=-77-\left(-29\right)=-48\)
\(b,27+\left(-36\right)-\left(-45\right)=-9-\left(-45\right)=36\)
\(c,-125-\left[\left(-18\right)-125\right]=-125-\left(-143\right)=18\)
\(d,140+\left[\left(-184\right)-140\right]=140+\left(-324\right)=-184\)
2, Tìm x biết:
\(a,x-\left(-15\right)=-8\)
\(x=-8+\left(-15\right)\)
\(x=-23\)
\(b,-40-x=-35\)
\(x=-40-\left(-35\right)\)
\(x=-5\)
\(c,x+\left(-50\right)=-27\)
\(x=-27-\left(-50\right)\)
\(x=23\)
a: \(-15-\left(-13+30\right)\)
\(=-15+13-30\)
\(=\left(-15-30\right)+13\)
=-45+13
=-32
b: \(225-150:\left(30+3^2\cdot5\right)\)
\(=225-150:\left(30+9\cdot5\right)\)
\(=225-150:75\)
=225-2
=223
c: \(18\cdot64+18\cdot36-1200\)
\(=18\left(64+36\right)-1200\)
\(=18\cdot100-12\cdot100\)
\(=6\cdot100=600\)
d: \(80-\left[130-\left(12-4\right)^2\right]\)
\(=80-130+\left(12-4\right)^2\)
\(=-50+8^2=64-50=14\)
