Răspuns :
a).-4,1+1,6=-2,5
b).2,8-5,5=-2,7
c).2/15-3/10=4/30-9/30=-5/30
d).-1/4+2/5=-5/20+8/20=3/20
e).-1 întreg 3/4+2 întregi 2/8=-7/4+23/8=-14+23/8=9/8
b).2,8-5,5=-2,7
c).2/15-3/10=4/30-9/30=-5/30
d).-1/4+2/5=-5/20+8/20=3/20
e).-1 întreg 3/4+2 întregi 2/8=-7/4+23/8=-14+23/8=9/8
a) -4,1 + 1,6 = -41/10 + 16/10 = (-41+16)/10 = -25/10 = -2,5
b) 2,8 - 5,5 = 28/10 - 55/10 = (28-55)/10 = -27/10 = -2,7
c) 2/15 - 3/10 = 4/30 - 9/30 = -5/30 = -1/6
d) -1/4+2/5 = -5/20 + 8/20 = 3/20
e) -1 si 3/4 + 2 si 7/8 = -7/4 + 23/8 = -14/8 + 23/8 = 9/8 = 1 si 1/8
b) 2,8 - 5,5 = 28/10 - 55/10 = (28-55)/10 = -27/10 = -2,7
c) 2/15 - 3/10 = 4/30 - 9/30 = -5/30 = -1/6
d) -1/4+2/5 = -5/20 + 8/20 = 3/20
e) -1 si 3/4 + 2 si 7/8 = -7/4 + 23/8 = -14/8 + 23/8 = 9/8 = 1 si 1/8