4 вариант
отвечаю))))))))))))))
12+8.3x+1.5x=95.3
9.8x=95.3-12
9.8x=83.3
x=8.5
3/5*(-5/11+5/3) - 5/11*(-3/5+11/5) = -3/5*5/11 + 3/5*5/3 + 5/11*3/5 - 5/11*11/5 = -3/11 + 1 + 3/11 - 1 = 0
11/12*(23/37-12/11) + 23/37*(-11/12+37/23) = 11/12*23/37 - 11/12*12/11 - 23/37*11/12 + 37/23*23/37 = -1 + 1 = 0
4/5*(6/7-5/4) + 6/5*(5/6-4/7) = 4/5*6/7 - 4/5*5/4 + 6/5*5/6 - 6/5*4/7 = 0
<span>11/13*(13/22-3/7) + 3/13*(-13/3+11/7) = 11/13*(13/22-3/7) + 3/13*(11/7-13/3) = 11/13*13/22 - 11/13*3/7 + 3/13*11/7 - 3/13*13/3 = 11/22 - 33/91 + 33/91 - 1 = 0,5 - 1 = - 0,5</span>
6 2/3 ÷ 2 2/9 + 5/8 × 32/45 – 5 5/6 = 20/3 × 9/20 + 4/9 – 35/6 = 20/3 × 9/20 + 4/9 – 35/6 = 3 + 4/9 – 35/6 = – 43/18 = – 2 7/18
-9,1-5,2x=-4,5+11
-5,2x=6,5+9,1
5,2x=15,6
x=3