Question

уравнения.

40*х=900-600

х-420=400:5

Answer 1

40x=900-600
40x=300
X=7,5

X-420=400:5
X-420=80
x=80+420
X=500

Answer 2

спосибо

Answer 3

40х=900-600
40х=300
х=300:40
х=7,5

х-420=400:5
х-420=80
х=420+80
х=500