Предмет: Алгебра, автор: meuket

Решите уравнение номером 1

2 упростить 3......

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Ответы

Автор ответа: sangers1959
1

Объяснение:

IV.

1)

\frac{2x+5}{10} -\frac{3x-5}{20} =2\ |*20\\2*(2x+5)-1*(3x-5)=2*20\\4x+10-3x+5=40\\x=40-15\\x=25.

Ответ: x=25.

2)

(4x+1)(x+5)-(2x+1)(2x-3)=58\\4x^2+21x+5-(4x^2-4x-3)=58\\4x^2+21x+5-4x^2+4x+3=58\\25x=50\ |:25\\x=2.

Ответ: x=2.

III.

(3x+2)(2x-1)-3x*(2x+3)+2x=6x^2+x-2-6x^2-9x+2x=\\=-6x-2=-6*(-0,4)-2=2,4-2=0,4.

meuket: СПАСИБО БРАТАН!
sangers1959: УДАЧИ!
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