Ответ:
Объяснение:
5. √50 - 3√8 +7√2 = 5√2 -6√2+7√2=6√2.
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6. 1) (a-49)/(7+√a) = ((√a)² - 7²)/(√a + 7) = (√a-7)(√a+7)/(√a+7)=√a-7.
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2) (3√5 - 5)/4√5 = √5(3√5-5)/4√5√5=(15 - 5√5)/20=5(3-√5)/20=(3-√5)/4.
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Ответ:
Объяснение:
5. √50 - 3√8 +7√2 = 5√2 -6√2+7√2=6√2.
***
6. 1) (a-49)/(7+√a) = ((√a)² - 7²)/(√a + 7) = (√a-7)(√a+7)/(√a+7)=√a-7.
-------------
2) (3√5 - 5)/4√5 = √5(3√5-5)/4√5√5=(15 - 5√5)/20=5(3-√5)/20=(3-√5)/4.