срочно!! помогите
1)(1,2-х)(х+1,2)+1,8х+х²=0
2)0,49х²-3х-(0,7х+2)(0,7х-2)=0
3)(1,6х+1)(1-1,6х)-64х(1-0,04х)=0
1)(1,2-х)(х+1,2)+1,8х+х²=0
2)0,49х²-3х-(0,7х+2)(0,7х-2)=0
3)(1,6х+1)(1-1,6х)-64х(1-0,04х)=0
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Ответ:
х= -0,8
x = 4/3
х=1/64
Объяснение:
1) 1,2х+1,44-х²-1,2х+1,8х+х²=0
1,44+1,8х=0
1,8х=-1,44
х= -0,8
2) 0,49х²-3х-(0,7х+2)(0,7х-2)=0
-3x +4 = 0
-3x = -4
x = 4/3
3) (1,6х+1)(1-1,6х)-64х(1-0,04х)=0
1,6х-2,56х²+1-1,6х-64х+2,56х²=0
1-64х=0
-64х=-1
х=1/64