219-7.(x+1)=10².13

<=> 219 -7x -7 =100 . 13

<=> 212-7x=1300

-7x=1300 +212

-7x=1512

-x=1512:7

-x=216

x=-216

\(219-7.\left(x+1\right)=10^2.13\)

= \(212.\left(x+1\right)=1300\)

\(\text{= x + 1 = 1300 : 212}\)

= ..........tự tính 

g)\(2907\left(2x+1\right)=8721\)

⇔\(2x+1=3\)

⇔\(2x=2\)

⇔\(x=1\)

h)\(\left(4x-16\right):1905=60\)

⇔\(4x-16=114300\)

⇔\(4x=114316\)

⇔\(x=28579\)

i)\(23+3x=5^6:5^3\)

⇔\(23+3x=5^3\)

⇔\(23+3x=125\)

⇔\(3x=102\)

⇔\(x=34\)

k)\(219-7\left(x+1\right)=100\)

⇔\(7\left(x+1\right)=119\)

⇔\(x+1=17\)

⇔\(x=16\)

x= 102 +246+281+398+254+219

= (102 + 398)+( 281+219)+(246+254)

= 500+ 500+500

= 500 . 3

=1500

đúng 100% luôn đó

\(219-7\left[x+1\right]=100\)

\(\Leftrightarrow7\left[x+1\right]=219-100\)

\(\Leftrightarrow7\left[x+1\right]=119\)

\(\Leftrightarrow\left[x+1\right]=119:7\)

\(\Leftrightarrow\left[x+1\right]=17\)

\(\Leftrightarrow x=16\)

219 : 36 = 6 (dư 3)

219 : 36 = 6 (dư 3)

219-7.(x-5)=100

<=> 7.(x-5)=119

<=> x-5=17

<=> x=22

Đáp số: x=22

219-7.(x-5)=100

        7.(x-5)=219-100

         7.(x-5)=119

              (x-5)=119:7

               (x-5)=17

                x=17+5

                x=22

vậy x=22

a)\(x\left(x-3\right)-2x+6=0\)

\(\Leftrightarrow x\left(x-3\right)-2\left(x-3\right)=0\)

\(\Leftrightarrow\left(x-2\right)\left(x-3\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}x-2=0\\x-3=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=2\\x=3\end{cases}}\)

b)\(\left(3x-5\right)\left(5x-7\right)+\left(5x+1\right)\left(2-3x\right)=4\)

\(\Leftrightarrow15x^2-46x+35-15x^2+7x+2-4=0\)

\(\Leftrightarrow33-39x=0\Leftrightarrow33=39x\Leftrightarrow x=\frac{33}{39}\)

a) \(x\left(x-3\right)-2x+6=0\)

\(x\left(x-3\right)-2\left(x-3\right)=0\)

\(\left(x-3\right)\left(x-2\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-3=0\\x-2=0\end{cases}\Rightarrow\orbr{\begin{cases}x=3\\x=2\end{cases}}}\)

b) \((3x-5)(5x-7)+(5x+1)(2-3x)=4\)

\(15x^2-46x+35+10x-15x^2+2-3x-4=0\)

\(33-39x=0\)

\(3\left(11-13x\right)=0\)

\(11-13x=0\)

\(13x=11\)

\(x=\frac{11}{13}\)

219 - 7 . ( x + 1 ) = 1000

Đề sai rồi bạn ơi

Học kì 2 mới học số âm nên đề này sai

Sai đề

tại sao lại = 1000

Sửa PTK 219 thành 213

Ta có:

\(\Rightarrow M=27\left(Al\right)\)