А) 8*(а+4) = 8*а + 8*4 = 8а +32
б) 3*(7+х) = 3*7 + 3*х = 21+3х
в) 11*(а+b+5) = 11*a + 11*b +11*5 = 11a+11b+55
г) 6*(2*(у+5)) = 6*(2у+10) = 6*2у + 6*10 = 12у+60
д) <span>(х-y+с)*8 = 8x -8у + 8с
</span>
<span>42•70:60=2940:60=49
58•90:30=</span>5220:30=174
1) 7_1/2: 3/4= 15/2: 3/4=15/2*4/3= 5*2=10 грн. стоит 1 кг рыбы.
X-11/2=7/9*1/14, x-11/2=1/18, x=11/2+1/18 = 100/18=50/9, 2) x+23/4=111/8*5/7 ,x=555/56-23/4= (555-322)/56=233/56 3)2/3x+14= 44/9:5/27=44/9*27/5 2/3x+14=132/5 2/3x=132/5-14 ,2/3x=62/5 , x=62/5:2/3 =91/5=18.2.