Уравнения: 1.-3,2n+4,8=-2(1,2n+4,4) 2.-5(0,8x-1,2)=-x-7,2 3.-40(-7x+5)=-1600 ,!
288
293
Ответы на вопрос:
А) -0,7 • 9,31 + 0,69 • (-0,7) =
= (-0,7) • (9,31 + 0,69) =
= -0,7 • 10 = -7
6) 7,2 • (-5/8) + 7,2 • 7/9 =
= 7,2 • (-5/8 + 7/9) =
= 7,2 • ( -45/72 + 56/72) =
= 7,2 • 11/72 =
= 72/10 • 11/72 = 11/10 = 1,1
в) 14 • (2 1/14 - 5/7) =
= 14 • (29/14 - 10/14) =
= 14 • 29/14 - 14 • 10/14 =
= 29 - 10 = 9
= (-0,7) • (9,31 + 0,69) =
= -0,7 • 10 = -7
6) 7,2 • (-5/8) + 7,2 • 7/9 =
= 7,2 • (-5/8 + 7/9) =
= 7,2 • ( -45/72 + 56/72) =
= 7,2 • 11/72 =
= 72/10 • 11/72 = 11/10 = 1,1
в) 14 • (2 1/14 - 5/7) =
= 14 • (29/14 - 10/14) =
= 14 • 29/14 - 14 • 10/14 =
= 29 - 10 = 9
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