Ejercicios de Matemáticas

Ejercicio 1
x-15	=	-27
x	=	-27+15
x	=	-12

Comprobación

-12-15	=	-27
-27	=	-27 Ejercicio 2 -11x+12 = 144 -11x = 144-12 -11x = 132 x = 132/-11 x = -12 Comprobación -11(-12)+12 = 144 132+12 = 144 144 = 144 Ejercicio 3 -8x-15 = -111 -8x = -111+15 -8x = -96 x = -96/-8 x = 12 Comprobación -8(12)-15 = -111 -96-15 = -111 -111 = -111 Ejercicio 4 6x-10 = -16 6x = -16+10 6x = -6 x = -6/6 x = -1 Comprobación 6(-1)-10 = -16 -6-10 = -16 -16 = -16 Ejercicio 5 -15x-6 = 9 -15x = 9+6 -15x = 15 x = 15/-15 x = -1 Comprobación -15(-1)-6 = 9 15-6 = 9 9 = 9 Ejercicio 6 12x+12 = 72 12x = 72-12 12x = 60 x = 60/12 x = 5 Comprobación 12(5)+12 = 72 60+12 = 72 72 = 72 Ejercicio 7 -10x+9 = -81 -10x = -81-9 -10x = -90 x = -90/-10 x = 9 Comprobación -10(9)+9 = -81 -90+9 = -81 -81 = -81 Ejercicio 8 5x-15 = 15 5x = 15+15 5x = 30 x = 30/5 x = 6 Comprobación 5(6)-15 = 15 30-15 = 15 15 = 15 Ejercicio 9 2x-13 = -19 2x = -19+13 2x = -6 x = -6/2 x = -3 Comprobación 2(-3)-13 = -19 -6-13 = -19 -19 = -19 Ejercicio 10 7x+5 = -100 7x = -100-5 7x = -105 x = -105/7 x = -15 Comprobación 7(-15)+5 = -100 -105+5 = -100 -100 = -100