suma
3/2+4/2 = 7/2
5/4+7/4 = 12/4 = 3 ...simplificado
1/2+1/3 = 3/6 + 2/6 = 5/6 ....usamos fracciones equivalentes
2/4+8/4 = 10/4=5/2...sumamos directamente porque tenemos el mismo denominador
1/3+2/3 = 3/3 = 1
resta
5/4-2/4= 3/4
8/7-2/7= 3/7
6/9-3/9 = 3/9 = 1/3
4/2-3/2= 1/2
3/3-2/3 = 1/3
división= se resuelve cruzado multiplicandolos
2/4:2/3 = 2*3/4*2 = 6/8 = 3/4
1/2:2/7= 7/4
3/3:4/4 = 1
2/8:7/9 = 18/56 = 9/28
2/6:6/2= 4/36 = 1/9
multiplicación = se resuelve derecho multiplicandolos
2/2x4/5 = 8/10 = 4/5
1/3x7/7 = 7/21 = 1/3
5/6x9/8 = 45/48= 15/16
4/2x9/9 = 36/18 = 2
2/7x9/1= 18/7
expresiones algebraicas
a).p=3(a+b)+2(a-b)......................q=a+3b
p = 3a + 3b + 2a - 2b....................q = a + 3b
p = 5a + b........................................q = a + 3b
entonces
p +q = 5a + b + a + 3b
p+q = 6a + 4b
b).p=4x+3(2y+5(x-2y)............................ q=-3(x+5y)
p = 4x + 3(2y + 5x- 10y)......................... q = -3x - 15y
p = 4x + 6y + 15x - 30y.............................q = - 3x - 15y
p = 19x - 24y..............................................q = - 3x - 15y
entonces
p+q = 19x - 24y + (-3x - 15y)
p+q= 16x - 39y
c).p=m+n+3(m-2n)............... q=2m-8(m-5n)............... r=-4(m-3(m+2n))
p = m+n+ 3m - 6n..................q = 2m -8m + 40n..........r = -4(m -3m - 6n)
p = 4m - 5n............................. q = - 6m + 40n................r = 8m + 24n
entonces
p+q+r = 4m - 5n + (-6m + 40n) + (8m + 24n)
p+q+r= 10m + 59n
espero que te sirva, salu2!!!!
