59 la dung

99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999969999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999989999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999996999999999999999999999999999999999999999999998999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999699999999999999999999999999999999999999999999999999999999999999999999999999999999899999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999996999999999999999999999999999999999999999999998

Ta có : 80+x=190

<=>x=190-80

<=>x=110

Vậy x=110

Độ dài đáy bé hình thang là

2,2 - 0,4 = 1,8 ( m )

Chiều cao hình thang là

( 2,2 + 1,8 ) : 2 = 1,5 ( m )

Diện tích hình thang là

( 2,2 + 1,8 ) : 2 x 1,5 = 4,5 ( m2 )

Đáp số 4,5 m2

Ta có \(\hept{\begin{cases}x^2yz^3=4^3\left(1\right)\\xy^2=4^9\left(2\right)\end{cases}}\)

Lấy (1).(2) vế theo vế ta được

\(x^3y^3z^3=4^3.4^9=4^{12}\)

\(\Leftrightarrow xyz=4^4=256\)  

102

tk mình nhé

Y + 30 = 90 : 2 

Y  + 30 = 45

Y           = 45 - 30

Y            = 15

x = 380 b nhé! nhớ k cho m