Объяснение:
1)√9*36=√324=18
2)√0.64*25=√16=4
3)√6,25*0,16=√1=1
4)√49/81=7/9
5)√11 1/9=√100/9=10/3
6)√3 13/36=√121/36=11/6
2 задание
√2*√18=√2*18=√36=6
√99/√11=√99/11=√9=3
√5*√45=√5*45=√225=15
√8/√50=√8/50=√4/25=2/5
√3/7 *√3 *√1/7=√3*3/7*7=√9/49=3/7
√12.1*0.4=√4.84=2.2
А²-13а+30=0
Д=(-13)²-4*30=169-120=49
а1=13-7/2=3
а2=13+7/2=10
-2а²+5а+3=0
Д=5²-4*(-2)*3=25+24=49
а1=-5-7/2*(-2)=3
а2=-5+7/2*(-2)=-0.5
1 5/6х = 3 * 11
11/6х = 33
Х = 33: 11/6
Х = 18
1)
2x(x+2)=5(x+2)
2x^2+4x=5x+10
2x^2-x-10=0.
a=2; b=-1; c=-10.
D= b^2-4ac = 1+80 = 81 = 9
x1= -b-√d:2a = 1-9:4=-2
x2=-b+√d:2a = 1+9:4 = 5:2 = 2,5