Resposta:
a) 42x + 12x - 20x = 54x - 20x = 34x
b) 25x + 12y - 10x + 4y = 15x + 16y = 31xy
c) 0,25y + 1,5y - 2y = 1,75y - 2y = - 0,25
d)(w/3) + (w/2) + (w/3) = ( 2w/6) + (3w/6) + (2w/6) = (2w + 3w + 2w) / 6 = (7w/6)
e) 2d - 4d + 12d + d = - 2d + 12d + d = 10d + d = 11d
f) (2/3) × (-1/2) = (2 × -1) / (3 × 2) = -2/6 = (-2/6) ÷ 2 = -1/3
g) 2,43m - 1,45m + 0,25m = 0,98m + 0,25m = 1,23m
f) 0,4y + y sobre 4 = 0,4y = (4/10)y = (2/5)y (2/5)y + y/4 = (8/20)y + (5/20)y = (8y/20) + (5y/20) = (8y + 5y) / 20 = 13y / 20
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Resposta:
a) 42x + 12x - 20x = 54x - 20x = 34x
b) 25x + 12y - 10x + 4y = 15x + 16y = 31xy
c) 0,25y + 1,5y - 2y = 1,75y - 2y = - 0,25
d)(w/3) + (w/2) + (w/3) = ( 2w/6) + (3w/6) + (2w/6) = (2w + 3w + 2w) / 6 = (7w/6)
e) 2d - 4d + 12d + d = - 2d + 12d + d = 10d + d = 11d
f) (2/3) × (-1/2) = (2 × -1) / (3 × 2) = -2/6 = (-2/6) ÷ 2 = -1/3
g) 2,43m - 1,45m + 0,25m = 0,98m + 0,25m = 1,23m
f) 0,4y + y sobre 4 = 0,4y = (4/10)y = (2/5)y (2/5)y + y/4 = (8/20)y + (5/20)y = (8y/20) + (5y/20) = (8y + 5y) / 20 = 13y / 20