3x+15=7-5x
3x+5x=7-15
8x=-8
x=-8:8
x=-1
26,9 = 269/10
Отметь этот ответ как за лучший)))
= 9а²b⁴√(-6ab)
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A) 2 = 4/2
б) 2 = 6/3
в) 2 = 8/4
г) 2 = 2/1
А)
2 1/4 : 3 * (3 - 1 2/3) + 5/6 =
= 9/4 : 3 * (9/3 - 5/3) + 5/6 =
= 9/4 * 1/3 * 4/3 + 5/6 =
= 1 + 5/6 = 1 5/6,
Б)
1/2 + 10 : (5 - 1 1/4) * 1 4/5 =
= 1/2 + 10 : (20/4 - 5/4) * 9/5 =
= 1/2 + 10 : 15/4 * 9/5 =
= 1/2 + 10 * 4/15 * 9/5 =
= 1/2 + 24/5 =
= 5/10 + 48/10 =
= 53/10 = 5 3/10