Question

Упростите выражение, приводя подобные слагаемые 1) a+4b-a-7b 2) -2x+3.7+2x-5 3) a-4/5a-1/7a 4) 0.2d-2/3-2d+5/9 5) y-3.2+2y-4.6-5y 6) -z+2.3x+0.11z=8.9x 7) -c+2/3b-2/7c-4/9b 8) m-0.8m-1/5m-1/2m

Answer 1

1) а+4b-a-7b==-3b
2) -2x+3.7+2x-5=-2.3
3) a-4/5a-1/7a=1/5a-1/7a=7/35a-5/35a=2/35a
4) 0.2d-2/3-2d+5/9=-1.8d-6/9+5/9=-1.8d-1/9
5) y-3.2+2y-4.6-5y=-7.8-2y
6)-z+2.3x+0.11z-8.9x=-6.6x-0.89z
7) -c+2/3b-2/7c-4/9b=-1 2/7c+6/9b-4/9b=-1 2/7c+2/9b
8) m-0.8m-1/5m-1/2m=0.2m-0.2m-0.5m=-0.5m

Answer 2

1) a + 4b - a - 7b = (a - a) + (4b - 7b) = -3b 2) -2x + 3.7 + 2x - 5 = (-2x + 2x) + (3.7 - 5) = -1.3 3) a - 4/5a - 1/7a = (a - 4/5a - 1/7a) = (1 - 4/5 - 1/7)a = (35 - 28 - 5)/35a = 2/35a 4) 0.2d - 2/3 - 2d + 5/9 = (0.2d - 2d) + (-2/3 + 5/9) = -1.8d + (-6/9 + 5/9) = -1.8d - 1/9 5) y - 3.2 + 2y - 4.6 - 5y = (y + 2y - 5y) + (-3.2 - 4.6) = -2y - 7.8 6) -z + 2.3x + 0.11z = 8.9x = (2.3x + 8.9x) + (-z + 0.11z) = 11.2x + 0.89z 7) -c + 2/3b - 2/7c - 4/9b = (-c - 2/7c) + (2/3b - 4/9b) = (-1 - 2/7) c + (6/9 - 4/9) b = (-9/7) c + (2/9) b 8) m - 0.8m - 1/5m - 1/2m = (m - 0.8m - 1/5m - 1/2m) = (1 - 0.8 - 1/5 - 1/2)m = (10 - 8 - 2 - 5)/10 m = (-5/10) m = -1/2 m