0,47=0,47x100=47%
3/4=0,75x100=75%
1,6=1,6x100=160%
0,78=0,78x100=78%
0,9=0,9x100=90%
1. (612237-240037):40=9 305
1} 612237-240037=372 200
2} 372 200:40=9 305
2. 70×(100100-99800)=91 000.
1} 100100-99800= 300
2} 300×70=2100.
1\3+х=5\12
1\3=4\12
х=5\12-4\12
х=1\12
проверка:
4\12+1\12=5\12