Câu 6:
a)x-2=-6
x=-4
b)(x-23)=23-34
x-23=-11
c)-4;-3;-2;-1;0
d)
/x+2/=4
=>x+2=4 =>x+2=-4
x=2 x=-6
Bài 1:
a)-10
b)-396
c)-1000
d)10000
Bài 2:
a) -50
b)-(-256)+(-156)-324+32
=>256+(-156)-324+32
=>100-324+32
=>(-224)+32
=>-192
Bài 3 :
a)-76.11
=>-76.(10+1)
(-76).10+(-76).1
=>-760+-76
-836
b)65.(-101)
65.(-100+-1)
65.-100+65.-1
-6500+-65
-6565
Bài 4:
a)3x-(-36)=-27
3x=-27+-36
3x=-63
x=-21
b)/x+25/=27+12
/x+25/=39
=>x+25=39 x+25=-39
=>x=14 x=-64
Bài5 :
Ta có:(x+3)(y-5)=-5.5
x+3 -5 5
y-5 -5 5
x= -5-3 5-3
y= -5+5 5+5
x= (-8);2
y=0;10
