100 + 90 + 10 + 2090

= 100 + ( 90 + 10 ) + 2090

= 100 + 100 + 2090

= 200 + 2090

= 2290

yhi

100+90+10+2090

= 2290 

ai k miik mik k lại 

X x 10 + X + X = 2016

X x ( 10 + 1 + 1 ) = 2016

X x 12 = 2016

        X = 2016 / 12

        X = 168                            k mk , mk sẽ k lại bn

\(x\times10+x+x=2016\)

\(x\times10+x\times2=2016\)

    \(x\times\left(10+2\right)=2016\)

                  \(x\times12=2016\)

                              \(x=2016:12\)

                              \(x=168\)

ai k mik mik k lại

ko nói dối

210

tk minh nha

= 210 nha mk nhanh nhất

\(x-\frac{2}{5}=\frac{10}{5}\)

\(x=\frac{10}{5}+\frac{2}{5}\)

\(x=\frac{12}{5}\)

\(\frac{10}{5}-x=\frac{2}{5}\)

\(x=\frac{10}{5}-\frac{2}{5}\)

\(x=\frac{8}{5}\)

\(x-\frac{2}{5}=\frac{10}{5}\)

           \(x=\frac{10}{5}+\frac{2}{5}\) 

          \(x=\frac{12}{5}\)

\(\frac{10}{5}-x=\frac{2}{5}\)

              \(x=\frac{10}{5}-\frac{2}{5}\)

               \(x=\frac{8}{5}\)

x=10cm

\(1) 420+65.4=(x+175):5+30\)

\(\implies 420+260=(x+175):5+30\)

\(\implies 680=(x+175):5+30\)

\(\implies 650=(x+175):5\)

\(\implies 650.5-175=x\)

\(\implies 3075=x\)

\(2)x-4867=(175.2050.70):25+23\)

\(\implies x-4867=1004500+23\)

\(\implies x-4867=1004523\)

\(\implies x=1009390\)

\(3) 134-[(96-7x):4-2]=126\)

\(\implies (96-7x):4-2=8\)

\(\implies(96-7x):4=10\)

\(\implies 96-7x=40\)

\(\implies 7x=56\)

\(\implies x=8\)

\(4) 4-\{100-[(100-5x):8-5]:10\}:25=0\)

\(\implies 4-\{100-[(100-5x):8-5]:10\}=0\)

\(\implies 100-[(100-5x):8-5]:10=4\)

\(\implies 100-[(100-5x):8-5]=40\)

\(\implies (100-5x):8-5=60\)

\(\implies (100-5x):8=65\)

\(\implies 100-5x=520\)

\(\implies 5x=-420\)

\(\implies x=-84\)

~ Hok tốt a~

ai nua cac ban

2+3+4+5+6+7+8+9+10

=44

bn tk mk nha.

54

Ai k mình mình k lại

1*2*3*4*5*6*7*8*9*10 = 3628800

t minh minh t lai cho

=3628800