Question

calculati :a)2,4•52,3+47,7 =
b)17,05²-17,05•7,05=
c)2,7²+2,7+1,7²=
d)1,4²+2,744:1,4=
Dau coroana♥♥

Answer 1

Răspuns:

• $\bf \red{a) ~~173,22}$
• $\bf \purple{b)~~170,5 }$
• $\bf \pink{c)~~12,88}$
• $\bf \blue{d)~~3,92}$

Explicație pas cu pas:

$\bf~~$

$\bf a) ~~\underline{2,4\cdot52,3}+47,7 =125,52+47,7=\red{\underline{\underline{173,22}}}$

________________________

$\bf b) ~~17,05^2-17,05\cdot7,05=17,05\cdot\big(17,05^{2-1}-7,05\big)=$

$\bf 17,05\cdot\big(17,05^{1}-7,05\big)=17,05\cdot10=\purple{\underline{\underline{170,5 }}}$

________________________

$\bf c) ~~2,7^2+2,7 + 1,7^2=2,7\cdot\big(2,7^{2-1}+2,7^{1-1}\big)+1,7^2=$

$\bf 2,7\cdot\big(2,7^{1}+2,7^{0}\big)+2,89= 2,7\cdot\big(2,7+1\big)+2,89=$

$\bf 2,7\cdot3,7+2,89=9,99+2,89=\pink{\underline{\underline{12,88}}}$

________________________

$\bf d) ~~1,4^2+2,744:1,4=1,96+2,744:1,4=$

$\bf 1,96+1,96=\blue{\underline{\underline{3,92}}}$

În link-ul de mai jos ai un exercițiu asemănătoar cu puteri și câteva formule ce te vor ajuta:

https://brainly.ro/tema/8851693

==pav38==

Baftă multă !