\(a,\left(-12\right).1125.\left(-9\right).\left(-5\right).3=-1822500< 0\)
\(b,21.\left(-25\right).\left(-6\right).\left(-3\right).18.\left(-2022\right)=343942200>0\)
Bài 1: Tìm x ∈ Z, biết:
a) x.(x-1)=0 d) (3-x).|x+5|=0
b) -x.(x+3)=0 e) (|x|+1).(4-2x)=0
c) (2x-4).(x+2)=0 g) x2+5x=0
bài 2: Tìm x,y ∈ Z, biết:
a) (x+3).(y-5)= 7
b) xy + 3x - 2y= 11
c) xy + 3x - 7y= 21
GIÚP MK VỚI! AI NHANH MK TICK CHO!
Tìm x biết: a)-12.(x-5)+7.(3-x)=15 b)30.(x=2)-6.(x-5)-24x=100 c)(x-3).(2x+1)=0d)(x-7).(x+3)=0
Tìm x thuộc Z
a,( \(^{x^2}\) -5) . ( \(^{x^2}\) - 25 ) <0
b, ( x + 5 ) . ( 9 + \(^{x^2}\) ) <0
c, ( x + 3 ) . ( \(^{x^2}\) + 1 ) =0
d, ( x + 5 ) . ( \(^{x^2}\) - 4 ) = 0
Bài 1:
a) -2.(x-5)-x+7=-7
b) 25-2.(x-5)2=7
c) (x2+5).(-9-3x)=0
d) (x2-1).(7-x2)>0
So sánh :
a) \(\left(-3\right).1574.\left(-7\right).\left(-11\right).\left(-10\right)\) với \(0\)
b) \(25-\left(-37\right).\left(-29\right).\left(-154\right).2\) với \(0\)
so sánh :
a) (-1)(-2)(-3).....(-2020)với 0
b) (-1)(-2)(-3)......(-2021) với0
mọi người hãy giúp em bài này . Em cảm ơn
4 [-2(8:4)+15(-3)-(-12)
3(25:5-14:2)-5(6:2)
[-15:(-3)]-3[2(5-9):3]
-16:(-4)[7-2(15:3)]
-7[8-3(14:7)-12:(-4)]-3(-2)
2[3-9:(-3)+2(5-7)]-18:(-9)
-16:(-8)+5[3-15:5+2] (-3+4)
4[-2(8:4)+15:(-3)-(-12)
3(25:5-14:2)-5(6:2)
[-15:(-3)]-3[2(5-9):3)]
-16:(-4)[7-2(15:3)]
-7[8-3(14:7)-12:(-4)]-3(-2)
2[3-9:(-3)+2(5-7)]-18:(-9)
-16:(-8)+5[3-15:5+2] (-3+4)
1/ -7(5-x)-2(x-10)=15
2/ 4(x-5)-3(x+7)= -19
3/ 4(2-x)+3(x-5)=14
4/ 7(x-9)-5(6-x)=-6+11x
5/ -7(3x-5)+2(7x-14)=28
6/ 5(4-x)-7(-x+2)=4-9+3
7/ 4x-5(-3+x)=7
8/ 5(x-7)+10(3-x)=20
9/ 7(5-x)+5(x-2)=15
