X⁴=(4x-5)²
x²=4x-5 x²=-(4x-5)
x²-4x+5=0 x²+4x-5=0
D=(-4)²-4*5=16-20=-4 D=4²-4*(-5)=16+20=36
Действительных корней нет x=(-4-6)/2=-5 x=(-4+6)/2=1
Ответ: -5 и 1
1.
1) 28/33 * 11/7=308/231=4/3=1 1/3
2) 18/7 * 14/27=252/189=4/3=1 1/3
3) 2/1 * 11/10=22/10=2,2
4) 12/13 * 1/6=12/78=2/13
3.
36/0,4=90
4.
1) 18/5 * 25/12=450/60=7,5
2) 12-7,5=4,5=9/2
3) 9/2 * 8/27=72/54=4/3=1 1/3
6.
1) 65/6 * 8/13=520/78=20/3=40/6
2) 65/6-40/6=25/6
3) 5/1 * 6/25=30/25=1,2
40000-41656:82+9087= 40 000 - 508 + 9 087 = 48 579
54049+3070*93-7358= 54 049 + 285 510 - 7 358 = 332 201
2888:76*51=38*51 = 1 938
2632:94*42 =28*42 = 1 176