Question

реши уравнения 10*х=8*25 x:20=4800:8. (x-380)*50=2000. (x+8):70=4. 640:(25-х)=40. 2700:(х-12)=90

Answer 1

10х = 200,  х=20
х/20=4800/8   х/20=600, х=600*20=18000
х-380= 2000/50=40,  х=380+40=420
х+8=4*70=280, х=280-8=272
640/(25-х)=40, 640=40*(25-х) , 640=1000-40х, 40х=1000-640=360, х=360/40=9
2700/(х-12)=90, 2700= 90х-1080,  90х=3780, х= 42