jnoss44
29.05.2020 •
Mathematics
Pls help with this one thank you guys!
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Ответ:
68.8 cm²
Step-by-step explanation:
Area of trapezium = 1/2(sum of parallel sides) × height
Area = ½(8.6 + 12.9) × 6.4
Area = ½ × 21.5 × 6.4
Area = 21.5 × 3.2 = 68.8 cm²
Ответ:
(3x + 5)(3x + 3)
Step-by-step explanation:
x+9x²+23x+ 15 = 9x²+24x+ 15 =9x²+24x+ 16 - 1
= (3x + 4)² - 1
= (3x + 4 + 1)(3x + 4 - 1)
=(3x + 5)(3x + 3)