решение разделено по действиям
m²-2m+4 2m²+m (m²-2m+4) *m*(2m+1) m
-------------* ------------ = ------------------------------------------------ = ----------------
4m²-1 m³+8 (2m-1)(2m+1)*(m+2)*(m²-2m+4) (2m-1)(m+2)
------------------------------------------------------------------------------------------------------
m m+2 m m+2
------------------ - ------------- = ------------------ - --------------------- =
(2m-1)(m+2) 2m²- m (2m-1)(m+2) m*(2m-1)
m *m - (m+2)(m+2) m²-(m+2)²
---------------------------------------- = --------------------------- =
(2m-1)*(m+2) *m (2m-1)*(m+2)*m
m²- (m²+2m+4) m²- m²- 2m-4 -2(m+2) -2
--------------------------- = ------------------------- = ------------------------- = ------------
(2m-1)*(m+2)*m (2m-1)*(m+2)*m (2m-1)*(m+2)*m (2m-1)m
------------------------------------------------------------------------------------------------------
-2 4 -2 *m(m+2) -(m+2)
------------- : ------------ = --------------------- = ------------------
(2m-1)m m²+2m (2m-1)m *4 (2m-1)*2
---------------------------------------------------------------------------------------------------
-(m+2) 10m+1 -(m+2) 10m+1
----------------- - --------------- = -------------- + ------------- =
(2m-1)*2 4-8m (2m-1)*2 8m- 4
-(m+2) 10m+1 - 2*(m+2)+10m+1
--------------+ ------------------- = ---------------------------- =
(2m-1)*2 4* (2m-1) 4* (2m-1)
-2m -4+10m+1 8m- 3
----------------------- = ---------------
4* (2m-1) 4* (2m-1)
7х*3-5х*6=6,75
21х-30х=6,75
-9х=6,75
х=6,75/-9
х= -0,75
4(b-4)-(b-15); 4b-16-b+16; сокращаем минус16 и плюс16 4b-b=3b; 2). 10x+5(x-2); 10x+5x-10; 15x=10; x=10/15; сокращаем и получитсях=2/3