5/8 = 0,625 1/8 = 0,125
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1,5х + 0,625 = 0,75х - 0,125
1,5х - 0,75х = - 0,125 - 0,625
0,75х = - 0,75
х = - 0,75 : (0,75)
х = - 1
4х² - 22х + 10 = 0
D = b² - 4ac = (-22)² - 4·4·10 = 484 - 160 = 324
22 - √324 22 - 18
х₁ = ----------------- = ------------ = 4/8 = 1/2 = 0,5
2 * 4 8
22 + √324 22 + 18
х₂ = ------------------- = -------------- = 40/8 = 5
2 * 4 8
1)0,8*12=9,6(км/ч). 2) 9,6:0,3=32(км)
А) 2*(-3)
б) 20 - 4*4=4
в)6*2+3*2=17
г)40+23
5к=489+296
5к=785
к=785/5
к=157