+) Nếu x > 0
B = 3 . ( -1 ) - 2 . ( x + 3 )
B = -3 - 2x - 6
B = -9 - 2x
+) Nếu x < 0
B = 3 . ( - 1 ) - 2 . ( -x - 3 )
B = -3 + 2x + 3
B = 2x
Rut gon bieu thuc
(x+1)2 - (x-1)2 - 3. (x+1). (x-1)
rut gon bieu thuc
B=1/2+(1/2)^2+(1/2)^3+...+(1/2)^99
rut gon bieu thuc 2ax^2-a(1+2x^2)-[a-x(x+a)]
Rut gon bieu thuc B=3/2-(3/2)^2+(3/2)^3-.........(3/2)^2014
1 rut gon bieu thuc ; A=5Ix+1I-3.[4-2x]
Moi nguoi giup minh vs:
Rut gon bieu thuc:
a, 5^n +5^(n+2)
b,2/3. 3^(n-1)
Rut gon bieu thuc:
m=\(\frac{2^5.15^3}{6^3.10^2}\)
Bai 1: Rut gon bieu thuc sau
B=(2/3)^3×(-3/4)^4×(-1)^5/(2/5)^2 × (-5/12)^3
Bai 2: Tim ia tri bieu thuc sau
M= 512- 512/2- 512/2^2- 512/2^2 - 512/2^3...512/2^10
rut gon bieu thuc 3^6*45^4-3^10*15^3/27^4*25^3+45^6
