cho x,y la 2 so nguyen cung dau va gia tri tuyet doi cua x va y = 10. tinh x,y
Chung minh: Voi moi a,b thuoc tap hop Z thi gia tri tuyet doi cua a+b < hoac = gia tri tuyet doi cua a + gia tri tuyet doi cua b
tinh gia tri bieu thuc:
a)a.(b+c)-d.(b+c)
Voi a-d=-7
b+c=12
b)ax-ay+bx-by
Voi a+b=15
x-y=-4
c)ax+by+bx+ay
voi a+b=25
x+y=-8
tinh gia tri bieu thuc
x^2+x-8voi x =-2
-5x^3.|x-1|+15 voi x=-2
-(x-1).(x+2)voi |x|=3
(4x-5).(x-7)voi(x-2).(x+3)=0
tinhgia tri bieu thuc
ax+bx voi a+b=-125, x=-8
ax-ay+bx-by voi a+b =15 , x-y=-4
cho a va b la hai so nguyen khac dau. khi do gia tri tuyet doi cua a nhan gia tri tuyet doi cua b = k.a.b. vay k =?
bai 1 so cac gia tri nguyen cua x de gia tri tuyet doi cua x + gia tri tuyet doi cua x-2 =0
bai 2 so cac gia tri nguyen cua x thoa man gia tri tuyet doi cua x-3 + gia tri tuyet doi cua 8-2x = 1 là
gia tri tuyet doi cua x-2 +2 . gia tri tuyet doi ua x-y =0
tinh gia tri bieu thuc :
a)M=m2(m2-n).(m3-n6).(m+n2) voi m=-16,n=-4
b,B=-34x+34y biet x-y=2
c,ax-ay+bx-by biet a+b=-7 va x-y=-1
minh dang acn gap giai dum nha cma on :3 :3
