3x(2x+1-4x^2-2x)=3x-12^3 (2x- сокращаются)
3x(1-4x^2)= 3x-12^3
3x - 12x^3 = 3x-12^3
159.
a) 6y^2 - 3y + 4y - 2 = 6y^2 + y - 2 = 54 + 9 - 2 = 52 + 9 = 61
б) 12m - 6 - 30m^2 + 15m = -30m^2 + 27m - 6 = -30*4 - 54 - 6
А) 3 2/15 х + 1 7/10 х = 9 2/3
47/15х + 17/10х = 29/3
470/150х + 255/150х = 29/3
725/150х = 29/3
145/30х = 29/3
29/6 х = 29/3
х = 29/3 : 29/6
х = 29/3 * 6/29
х = 6/3
х = 2
б) (х - 3/8х) * 2 4/5 - 1 3/14 = 2 2/7
(х - 3/8х) * 14/5 - 17/14 = 16/7
(х - 3/8х) * 14/5 = 16/7 + 17/14
(х - 3/8х) * 14/5 = 32/14 + 17/14
(х - 3/8х) * 14/5 = 49/14
(х - 3/8х) * 14/5 = 7/2
х - 3/8х = 7/2 : 14/5
х - 3/8х = 7/2 * 5/14
х - 3/8х = 1/2 * 5/2
х - 3/8х = 5/4
1/1х - 3/8х = 5/4
8/8х - 3/8х = 5/4
5/8х = 5/4
х = 5/4 : 5/8
х = 5/4 * 8/5
х = 8/4
х = 2
1/3+7/20=20/60+21/60=41/60
60/60-41/60=19/60
2314/19*60=7307,3684210526315789473684210526
25см=25/100м=1/4м
30см=30/100м=3/10м
60см=60/100м=3/5м
85см=85/100м=17/20м
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