90+а=984/2
90+а-984/2=0
180+2а-984/2=0
2а-804/2=0
2а-804=0
2а=804
а=402
1 способ:
1) 9+7 = 16
2) 16 • 2 = 32
2 способ:
1) 2 •7 = 14
2) 2•9=18
3) 18+14=32
<span>256:10=25,6
</span><span>37,5:10=3,75
3:100=0,03
70,2:100=0,702
0,96:1000=0,00096
125,7:100=1,257</span>