\(100:25+7.7=4+49=53\)

= 11,7 nhớ k cho mk

2 nhe ban 

1 + 1 = 2

@Bảo

#Cafe

Chu vi hình chữ nhật là:

      (15 + 9) x 2 = 48 (cm)

Diện tích hình chữ nhật là:

        15 x 9 = 135 (cm\(^2\))

                   Đáp số: 48 cm

                                135 cm\(^2\)

@Bảo

#Cafe

\(x+x\times\frac{1}{3}+\frac{5}{18}=1\frac{1}{6}\)

\(x+x\times\frac{1}{3}+\frac{5}{18}=\frac{7}{6}\)

\(x+x\times\frac{1}{3}=\frac{7}{6}-\frac{5}{18}\)

\(x+x\times\frac{1}{3}=\frac{8}{9}\)

\(x\times1+x\times\frac{1}{3}=\frac{8}{9}\)

\(x\times\left(1+\frac{1}{3}\right)=\frac{8}{9}\)

\(x\times\frac{4}{3}=\frac{8}{9}\)

\(x=\frac{8}{9}:\frac{4}{3}\)

\(x=\frac{2}{3}\)

Vậy \(x=\frac{2}{3}\)

#Y/n

\(x+x\times\frac{1}{3}+\frac{5}{18}=1\frac{1}{6}\)

\(x+x\times\frac{1}{3}+\frac{5}{18}=\frac{7}{6}\)

\(x+x\times\frac{1}{3}=\frac{7}{6}-\frac{5}{18}\)

\(x+x\times\frac{1}{3}=\frac{21}{18}-\frac{5}{18}\)

\(x\left(1+\frac{1}{3}\right)=\frac{16}{18}\)

\(x\left(\frac{3}{3}+\frac{1}{3}\right)=\frac{8}{9}\)

\(\frac{4}{3}x=\frac{8}{9}\)

\(x=\frac{8}{9}\times\frac{3}{4}\)

\(x=\frac{2}{3}\)

Câu 1 : a. 972

Câu 2 : b. 128

#Y/n

????????

\(\frac{8}{9}:x+\frac{4}{9}=\frac{10}{3}\)

\(\frac{8}{9}:x=\frac{10}{3}-\frac{4}{9}\)

\(\frac{8}{9}:x=\frac{26}{9}\)

\(x=\frac{8}{9}:\frac{26}{9}\)

\(x=\frac{4}{13}\)

@Bảo

#Cafe