X= 200 - 300 = -100
X= 900 + 400 = 1300
X= 180 : 90 = 2
X= 240 : 60 = 4
Tìm x :
x + 300 = 200
x = 200 - 300
x = -100
x - 400 = 900
x = 900 + 400
x = 1300
X x 90 = 180
X = 180 : 90
X = 2
240 : x = 60
x = 240 : 60
x = 4
\(x+300=200\)
\(\Rightarrow x=200-300\Rightarrow x=-100\)
\(x-400=900\Rightarrow x=900-400=500\)
\(xX90=180\Rightarrow x=180:90=9\)\(;\)\(240:x=60\Rightarrow x=240:60=4\)
x+300=200 x=100 x-400=900 x= 1300 x=9 x=4 k nha
x+ 300 = 200
=> x= - 100
đap số x = -100
x-400 = 900
=> x= 1300
đap số 1300