упростите выражения 2(a-b)-4(b-a)
3,2 (c+d)+5,8(c-d)
2/9(1,8m-5,4 )-3/7(2,1m-4,2)
3,2 (c+d)+5,8(c-d)
2/9(1,8m-5,4 )-3/7(2,1m-4,2)
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2)3,2c+3,2d+5,8c-5,8d=9c-2,6d.