1) 2*100=200
4*10=40
200+40+5=245
2) 5*100=500
500+7=507
<span> 2 5 1 3 6 4
42:6+(19+6):5-6•2=20
1.19+6=25
2. 42:6=7
3. 25 :5=5
4. 6*2 =12
5. 7+25 =32
6. 32-12 =20
1 3 6 4 7 2 5 8
(27-19)•4+18:3+(8+27):5-17=56
1. 27-19 = 8
2. 8+27 = 35
3. 8*4 =32
4. 18 :3 =6
5. 35:5=7
6. 6+32=38
7.38+35=73
8.73-17=56
4 1 2 5 3 6
60-(13+22):5-6•4+25=37
1.13+22=35
2. 35:5=7
3.6*4=24
4.60-24=36
5.36-24=12
6.12+25=37</span>
1)x=0,8:4/3
x=3/5.
2)3/25y=1,8
y=1/15
2/11х=24/100у
х=24/100*у:2/11
х=24/100*у*11/2
х=12/100*у*11
х=132/100у
х=1,32у, т.е. х больше у в 1,32 раза или на 32%