1. 80 : 8 = (40+40) : 8 = 40:8 + 40:8 = 5+5 = 10
2. 96:8 = (80+16) : 8 = 80:8 + 16:8 = 10 + 2 = 12
3. 90:9 = (45 + 45): 9 = 45:9 + 45:9 = 5+5= 10
4. 84: 7 = (42+42) : 7 = 42:7 + 42:7 = 6+ 6= 12
5. 70 : 7 = (35+35) : 7 = 35:7 + 35:7 = 5 + 5 = 10
6. 84:6 = (42+42):6 = 42:6 + 42:6 = 7 + 7 = 14
7. 50:5 = (25 +25):5 = 25:5 + 25:5 = 5 + 5 = 10
8. 85:5 = (50 = 35):5 = 50:5 + 35:5 = 10 + 7 = 17
9. 60:6 = (30 + 30):6= 30:6 + 30:6 = 5 + 5 = 10
10. 117 : 9 = (63 + 54):9 = 63:9 + 54:9 = 7 + 6 = 13
3\4:1\2=3\4*2\1=6\4
1\2+6\4=2\4+6\4=8\4=2
1)
(Х+7,2)*4,2=30,996
x+7,2=30,996:4,2
x+7,2=7,38
x=7,38-7,2
x=0,18
<span>2)
216:Х-9,3=50,7
216:x=50,7+9,3
216:x=60
x=216:60
x=3,6</span>
8√75 = 8√25*3=8*5√3=40√3
5√48=5√16*3=5*4√3=20√3
40√3 - 20√3 =20√3
100% - 8,5% = 91,5% = 0,915
0,915 * 20√3 = 18,3√3 - это число меньше разности на 8,5%