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Adriana423
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calculati 4,2√3•(-5√12)-7√5:(-14√5)

Răspuns :

Andreutzakriss
4,2√3•(-5√12)-7√5:(-14√5)=
=-21√36+98√25=
=-21·6+98·5=
=-126+490=
=364
Bafta!
Calculati 4,2√3•(-5√12)-7√5:(-14√5)


[tex]\it 4,2\sqrt3(-5\sqrt{12}) -7\sqrt5:(-14\sqrt5) = -21\sqrt{36} +\dfrac{7\sqrt5}{14\sqrt5} = \\\;\\ \it -21\cdot \it 6+ \dfrac{1}{2} = -126+\dfrac{1}{2} =-125,5 \ \ . [/tex]


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