\(\left(a+b\right)\left(a+b\right)\)
\(=\left(a+b\right)^2\)
\(=a^2+2ab+b^2\)
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\(\left(a+b\right)\left(a+b\right)\)
\(=\left(a+b\right)^2\)
\(=a^2+2ab+b^2\)
rut gon bieu thuc
(-a-b+c) - (-a-b-c)
rut gon bieu thuc
(-a-b+c) - (-a-b-c)-2b
rut gon bieu thuc
(-a-b+c) - (-a-b-c)-2b
cho bieu thuc A = /x-1/ + 3x-7
a. rut gon bieu thuc
b. tinh A khi x=3;x=-5
Cho bieu thuc : A = ( -a - b + c ) - ( -a - b -c )
a ) Rut gon A
rut gon bieu thuc
|a| . a
rut gon bieu thuc
|a| - a
cho bieu thuc a^3+2a^2-1/a^3+2a^2+2a+1
a) Rut gon bieu thuc
b)Chung minh rang neu a la so nguyen thi gia tri tim duoc cua bieu thuc o cau a) la 1 phan so toi gian
rut gon bieu thuc sau (voi x<-1,3)
a) A= /x+1,3/ - /x-2,5/
b) B =/-x-1,3/+/x-2,5/