Câu hỏi của Vương Minh Ngọc

Question

a)12.(x-5)+7(3-x)=5 b)2.x2-3=29

BW_P&A · Accepted Answer

a) $12x-60+21-7x-5=0$

$\Rightarrow5x-44=0$

$\Rightarrow5x=44$

$\Rightarrow x=\frac{44}{5}$

Vậy: $x=\frac{44}{5}$Câu trả lời: a) $12x-60+21-7x-5=0$

$\Rightarrow5x-44=0$

$\Rightarrow5x=44$

$\Rightarrow x=\frac{44}{5}$

Vậy: $x=\frac{44}{5}$

BW_P&A · Answer

b) $2x^2-3=29$

$\Rightarrow2x^2=3+29=32$

$\Rightarrow x^2=\frac{32}{2}=16$

$\Rightarrow x=\sqrt{16}=4$

Vậy: $x=4$Câu trả lời: b) $2x^2-3=29$

$\Rightarrow2x^2=3+29=32$

$\Rightarrow x^2=\frac{32}{2}=16$

$\Rightarrow x=\sqrt{16}=4$

Vậy: $x=4$