Ответы на вопрос:
2) -2х+3,7+2х-5= -1,3 3) а - 4/5а - 1/7а = а* ( 1-4/5-1/7) = = а * ((35- 28-5)/35)= 2/35 *а 4) 0,2d-2/3-2d+5/9 = -1.8d -1/9 5) y-3.2+2y-4.6-5y= -2y -7.8= -2*(y+3.9) 6)-z+2.3x+0.11z+8.9x= -0.89z+11.2x 7) -c +2/3b-2/7c-4/9b= -c(1+2/7)+b(2/3-4/9)= =- 9/7с+ 2/9b 8) m-0.8m-1/5m-1/2m= m(1-0.8-1/5-1/2)= = m ( 1-0.8-0.2-0.5) = -0.5m
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