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kitty73
@kitty73
July 2022
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срочно. нужно решить сегодня
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maktl1025
1) 0,6b+0,2= 1,4b+ 3,4
-0,8b = 3,2
b= 4
2)1,2а -0,3= 0,8а -2,7
0,4а= -2,4
а= -6
3)4,4m+4,07= 6,5+3,2m
1,2m= 2,43
m= 2,025
4)(2x-1)(5x+2)=0
10x²+ 4x -5x-2=0
10x²-x-2= 0
D= 1-4*10(-2)= 81
√81=9
x1= (1-9)/20= -8/20= -0,4
x2= (1+9)/20= 10/20= 1/2= 0,5
5)3(3x+1)-2,4(x-0,5)= -0,6
9x +3- 2,4x+1,2= -0,6
6,6x= -4,8
x= 8/11
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Answers & Comments
-0,8b = 3,2
b= 4
2)1,2а -0,3= 0,8а -2,7
0,4а= -2,4
а= -6
3)4,4m+4,07= 6,5+3,2m
1,2m= 2,43
m= 2,025
4)(2x-1)(5x+2)=0
10x²+ 4x -5x-2=0
10x²-x-2= 0
D= 1-4*10(-2)= 81
√81=9
x1= (1-9)/20= -8/20= -0,4
x2= (1+9)/20= 10/20= 1/2= 0,5
5)3(3x+1)-2,4(x-0,5)= -0,6
9x +3- 2,4x+1,2= -0,6
6,6x= -4,8
x= 8/11