Câu hỏi của Hàn Nguyệt Băng

Question

Giải các pt sau:

a. -$\frac{5}{9}$x +1=$\frac{2}{3}$x - 10

b. $\frac{x-22}{8}+\frac{x-21}{9}+\frac{x-20}{10}+\frac{x-19}{11}=4$

c. ( 5x +3)(x2  + 4 )(x - 4) = 0

d. ( 2x - 1)2 + ( 2 - x )( 2x...

💋Amanda💋 · Accepted Answer

https://i.imgur.com/hUeQcNa.jpgCâu trả lời: https://i.imgur.com/hUeQcNa.jpg

Thảo Nguyên · Answer

$\frac{-5}{9}x+1=\frac{2}{3}x-10$

$\frac{-5}{9}x+\frac{9}{9}=\frac{6}{9}x-\frac{90}{9}$

$-5x+9=6x-90$

$-5x-6x=-90-9$

$-11x=-99$

$x=\frac{-99}{-11}=9$

b. $\frac{x-22}{8}+\frac{x-21}{9}+\frac{x-20}{10}+\frac{x-19}{11}=4$

$\frac{x-22}{8}-1+\frac{x-21}{9}-1+\frac{x-20}{10}-1+\frac{x-19}{11}-1=0$

$\frac{x-30}{8}+\frac{x-30}{9}+\frac{x-30}{10}+\frac{x-30}{11}=0$

$\left(x-30\right)\left(\frac{1}{8}+\frac{1}{9}+\frac{1}{10}+\frac{1}{11}\right)=0$

x=30

Chúc bạn học tốt!!Câu trả lời: $\frac{-5}{9}x+1=\frac{2}{3}x-10$

$\frac{-5}{9}x+\frac{9}{9}=\frac{6}{9}x-\frac{90}{9}$

$-5x+9=6x-90$

$-5x-6x=-90-9$

$-11x=-99$

$x=\frac{-99}{-11}=9$

b. $\frac{x-22}{8}+\frac{x-21}{9}+\frac{x-20}{10}+\frac{x-19}{11}=4$

$\frac{x-22}{8}-1+\frac{x-21}{9}-1+\frac{x-20}{10}-1+\frac{x-19}{11}-1=0$

$\frac{x-30}{8}+\frac{x-30}{9}+\frac{x-30}{10}+\frac{x-30}{11}=0$

$\left(x-30\right)\left(\frac{1}{8}+\frac{1}{9}+\frac{1}{10}+\frac{1}{11}\right)=0$

x=30

Chúc bạn học tốt!!

Bài 3: Phương trình đưa được về dạng ax + b = 0