Question

Tìm x biết : 

1,(x-1).(y+5)=101

2,(x-2).(-y+5)=12

3,(x-5).(2x+6) < 0

4,(x-3).(2x+8) > 0

Làm nhanh nha . Mk cần gấp

 

Answer 1

1,(x-1)(y+5)=101

th1:x-1=101

<=>x=102

th2:y+5=101

<=>y=96

Answer 2

2,(x-2)(-y+5)=12

th1:x-2=12

<=>x=14

th2:-y+5=12

<=>-y=7

<=>y=-7

Answer 3

3,(x-5)(2x+6)<0

th1:x-5<0

<=>x<5

th2:2x+6<0

<=>2x<-6

<=>x<-3

Answer 4

4,(x-3)(2x+8)>0

th1:x-3>0

<=>x>3

th2:2x+8>0

<=>2x>-8

<=>x>-4

Answer 5

đảm bảo vs e 100% đúng ^^