1. 2-х
3. 6-4 (1-х)=2(3х+4)
2*(1-х)=2*(3+4)
2-2х=6+8
-2х=6+8-2
-2х=12
х=12÷(-2)
х=-6
5. 24 целых4/5-2=24,2
3:7 целых 2/3=9/23
1)4,1x(0,4+0,5y)=1,64x+2,05y
2)(2x-7y)(4x+3y)=8x²+6xy-28xy-21y²=8x²-22xy-21y²
3)(5x-3y)²=25x²-2.5x.3y+9y²=25x²-30xy+9y²
Г)2u-21+6u=3
8u=24
u=3
д)12-y=20-10y+10
9y=18
y=2
е)2-2x+16=4x-4
6x=22
x=22/6
<span>0.32*235.7+264.3*0.32=0,32(235,7+264,3)=0,32*</span>500=160