1т=1000 кг
364+х=1000
х=1000-364
х=636 (кг)
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364+636=1000
1000=1000
Ответ: 636 кг
(8×1+150)-6×1=158-6=152
(8×12+150)-6×12=246-72=174
2-4sin^2, если cos^2 X=3/4
1+1-4sin^2 X = sin^2 x+cos^2 x+sin^2 x+ cos^2 X - 4sin^2 X = 2sin^2 X + 2cos^2 X - 4sin^2 X = 2cos^2 X - 2sin^2 X = 2 (cos^2 X - sin^2 X )= 2 (cos^2 X -1+cos^2 X )=2 (3/4 - 4/4 + 3/4) = 2 (6/4 - 4/4)= 2 × 2/4= 1
Ответ:1/2
4/9-3/10=1/30
7/15+1/30=15/30=1/2