<span>(1,6х+1)(1-1,6х)-64х(1-0,04х)=0
1,6х-2,56х²+1-1,6х-64х+2,56х²=0
</span><span>1-64х=0</span>
-64х=-1
х=1/64
2x^2 + 2x - x^2 - 3x + 12 = x^2
x^2 - x + 12 - x^2 = 0
-x + 12 = 0
x = 12
1) = (1/2)^-4 × (5^3)^5 × (5^4)^-2 ÷(5^2)^3 = 2^4 × 5^15 × 5^-8 ÷ 5^6 × 2^4 × 5^9 × 5^-8 = 16 × 5^9 × 5^-8 = 80
2) х ÷ 1,5 = 30 ÷ 100 × 12
х ÷ 1,5 = 3,6
х = 3,6 ÷ 1,5
х = 2,4
10(х-2)²·2-5х(2х-1)=-4
10х²-400·2-10х²+5х=-4
-800+5х=-4
5х=-4+800
5х=796
х=796:5
х=159,2