Chiều cao hình tam giác :

( 30 x 2 ) : 5 = 12 ( cm )

Độ dài cạnh đáy hình tam giác :

( 12 : 4 ) x 5 = 15 (cm )

Diện tích hình tam giác lúc đầu :

( 15 x 12 ) : 2 = 90 ( cm² )

                      Đáp số:90cm²

k cho mik nha,ko đúng ko làm người

x=400

\(x+100=200+300\)

\(x+100=500\)

             \(x=500-100\)

             \(x=400\)

a.300

nha ban 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 phan tram 

 a nha bạn

bạn ghi không dấu nên mình không hiểu

\(403,60-395,54-3,60\)

\(=\left(403,60-3,60\right)-395,54\)

\(=400-395,54\)

\(=4,46\)

good luck At the speed of light

403,60 - 395,54 - 3,60

= (403,60 - 3,60) - 395,54

= 400 - 395,54

= 4,46

At the speed of light

2.542*354.22=900.42724

345.6 * 1.02 -345.6 -172.8 * 2 * 0.001

= 345.6 * 1.02 - 345.6* 1 - 345.6 * 0.001

= 345.6 * ( 1,02 - 1 - 0,001 )

= 345.6 * 0,019

= 6.5664

345.6 * 1.02 -345.6 -172.8 * 2 * 0.001

= 146,6 x 1,02 - 345,6 x 1 - 145,6 x 0,001

= 345,6 x ( 1,02 - 1 - 0,001 )

= 6,5664

k nhe

x + 1 = 300 + 200

x + 1 = 500

x       = 500 - 1

x       = 499

x + 1 = 300 + 200

x + 1 = 500

x = 500 + 1

x = 501

K mk nha

Mk k lại

x+100=500

x       =500-100

x       =400

x = 400

x = 300

tk mk nha nhanh nhất đó