Toán a,-(55-80+91)-(2012+80-91) b,x+76=58-(-16) 07/07/2021 By Valentina a,-(55-80+91)-(2012+80-91) b,x+76=58-(-16)
a,-(55-80+91)-(2012+80-91) = -55 +80 -91 -2012 -80 +91 = (80 -80) + (-91 +91) -55 -2012 = 0 + 0 -2067 = -2067 b,x+76=58-(-16) ⇔ x = 58 +16 -76 ⇔ x = -2 Vậy x= -2 Trả lời
a,-(55-80+91)-(2012+80-91) =-55+80-91-2012-80+91 =(80-80)+(-91+91)+(-55-2012) =0+0+(-2067) =-2067 b,x+76=58-(-16) x+76=74 x=74-76 x=-2 Vậy x=-2 Trả lời
a,-(55-80+91)-(2012+80-91) = -55 +80 -91 -2012 -80 +91
= (80 -80) + (-91 +91) -55 -2012
= 0 + 0 -2067
= -2067
b,x+76=58-(-16)
⇔ x = 58 +16 -76
⇔ x = -2
Vậy x= -2
a,-(55-80+91)-(2012+80-91)
=-55+80-91-2012-80+91
=(80-80)+(-91+91)+(-55-2012)
=0+0+(-2067)
=-2067
b,x+76=58-(-16)
x+76=74
x=74-76
x=-2
Vậy x=-2