2-4(х-3)=13+2х2+12-4x=13+2х-4x-2x=-14+13
-6x=-1
x=1/6
725-х=123
х=725-123
х=602
725-602=123
Ответ 602
А) 45-( 26-8)= 45-18 =27
б) (13-9) + 78= 4+78= 82
в) 80+(34-16)=80+18 = 98
г) 90-(49+27)= 90-76= 14
<span><span>у</span>=<span><span>(<span><span><span>2⋅x</span>4</span>⋅x+3</span>)</span>′</span>=</span><span>у=<span><span>(<span><span><span>2⋅x</span>4</span>⋅x</span>)</span></span></span><span>у=<span><span>(<span><span>2⋅x</span>4</span>)</span>′</span>⋅x+<span><span>2⋅x</span>4</span></span><span>у=<span><span><span>(<span>2⋅x</span>)</span>′</span>4</span>⋅x+<span><span>2⋅x</span>4</span></span><span><span>24</span>⋅x+<span><span>2⋅x</span>4</span></span>
Ответ:
<span><span>у</span>=<span>24</span>⋅x+<span><span>2⋅x</span>4</span></span>
3. |х|=(11,5 × 5,7) ÷ 6,9 = 9,5
→ х=9,5, х=-9,5.
4. |х|=(2,1 × 12,6) ÷ 9,8 = 2,7
→ х=2,7, х=-2,7.