№300
а)1 1/7* 3 1/16=8/7*49/16= 7/2= 3,5
б)2/9* 1 1/2= 2/9* 3/2=1/3
в)4 1/6* 8 2/5= 25/6* 42/5=35
г)3 9/13* 1 5/8=6
д)7/8* 5 1/3=7/8* 16/3=7/3= 2 1/3
е)7 5/7* 1 1/6=40/7* 7/6=20/3= 6 2/3
ж)1 4/5* 6 2/3=9/5* 20/3=12
з)4 1/2* 2 4/5= 9/2* 14/5=12 3/5= 12,6
и)3 3/11* 7 1/3=36/11* 22/3=24
к)10 2/7* 1 2/9=72/7* 11/9= 88/7= 12 4/7
л)2 1/2* 18/25= 5/2* 18/25=9/5= 1,8
м)5 1/7* 3 8/9=36/7* 35/9=20
1)3 1/4* 8= 13/4* 8/1=26
2) 5 1/3* 6=16/3* 6/1=31
3) 4* 1 1/2= 4/1* 3/2=6
4)7* 1 1/3= 7/1 * 4/3=28/3= 9 1/3
Пошаговое объяснение:
(у+9)(у-2)+(3-у)(6+5у)
у=-1/2
(-1/2+9)((-1/2)-2)+(3-(-1/2)(6+5(-1/2)= -9
- 1/ 2 + 9 = 9 - 1 /2 = 9·2 2 - 1 /2 = 18 /2 - 1/ 2 = 18 - 1/ 2 = 17/ 2 = 8·2 + 1 /2 = 8 1 /2 = 8.5
- 1 /2 - 2 = -2 1 /2 = -2.5
3 - (- 1 /2 ) = 3 + 1/ 2 = 3 + 1/ 2 = 3 1/ 2 = 3.5
5×(- 1 /2 ) = -5× 1/ 2 = - 5·1 /2 = - 5 /2 = - 2·2 + 1 /2 = -2 1 /2 = -2.5
8 1 2 ×(-2 1 /2 ) = -8 1 /2 ×2 1/2 = - 1 + 8·2 /2 × 1 + 2·2 /2 = - 17 2 × 5 /2 = - 17·5/ 2·2 = - 85 /4 = - 21·4 + 1 /4 = -21 1 /4 = -21.25
6 + (-2/ 1 2 ) = 6 - 2 / 1 2 = 6 - 2 - 1 /2 = 4 - 1 2 = 4·2 2 - 1 2 = 8 2 - 1 2 = 8 - 1 2 = 7 2 = 3·2 + 1 2 = 3 / 1 2 = 3.5
3 1 2 ×3 1 2 = 1 + 3·2 2 × 1 + 3·2 2 = 7 2 × 7 2 = 7·7 2·2 = 49 4 = 12·4 + 1 4 = 12 1 4 = 12.25
-21 1 4 + 12 1 4 = 12 1 4 - 21 1 4 = 1 + 12·4 4 - 1 + 21·4 4 = 49 4 - 85 4 = 49 - 85 4 = - 36 4 = - 9 · 4 4 = - 9 = -9
№300
а)1 1/7* 3 1/16=8/7*49/16= 7/2= 3,5
б)2/9* 1 1/2= 2/9* 3/2=1/3
в)4 1/6* 8 2/5= 25/6* 42/5=35
г)3 9/13* 1 5/8=6
д)7/8* 5 1/3=7/8* 16/3=7/3= 2 1/3
е)7 5/7* 1 1/6=40/7* 7/6=20/3= 6 2/3
ж)1 4/5* 6 2/3=9/5* 20/3=12
з)4 1/2* 2 4/5= 9/2* 14/5=12 3/5= 12,6
и)3 3/11* 7 1/3=36/11* 22/3=24
к)10 2/7* 1 2/9=72/7* 11/9= 88/7= 12 4/7
л)2 1/2* 18/25= 5/2* 18/25=9/5= 1,8
м)5 1/7* 3 8/9=36/7* 35/9=20
1)3 1/4* 8= 13/4* 8/1=26
2) 5 1/3* 6=16/3* 6/1=31
3) 4* 1 1/2= 4/1* 3/2=6
4)7* 1 1/3= 7/1 * 4/3=28/3= 9 1/3
Пошаговое объяснение:
(у+9)(у-2)+(3-у)(6+5у)
у=-1/2
(-1/2+9)((-1/2)-2)+(3-(-1/2)(6+5(-1/2)= -9
Пошаговое объяснение:
- 1/ 2 + 9 = 9 - 1 /2 = 9·2 2 - 1 /2 = 18 /2 - 1/ 2 = 18 - 1/ 2 = 17/ 2 = 8·2 + 1 /2 = 8 1 /2 = 8.5
- 1 /2 - 2 = -2 1 /2 = -2.5
3 - (- 1 /2 ) = 3 + 1/ 2 = 3 + 1/ 2 = 3 1/ 2 = 3.5
5×(- 1 /2 ) = -5× 1/ 2 = - 5·1 /2 = - 5 /2 = - 2·2 + 1 /2 = -2 1 /2 = -2.5
8 1 2 ×(-2 1 /2 ) = -8 1 /2 ×2 1/2 = - 1 + 8·2 /2 × 1 + 2·2 /2 = - 17 2 × 5 /2 = - 17·5/ 2·2 = - 85 /4 = - 21·4 + 1 /4 = -21 1 /4 = -21.25
6 + (-2/ 1 2 ) = 6 - 2 / 1 2 = 6 - 2 - 1 /2 = 4 - 1 2 = 4·2 2 - 1 2 = 8 2 - 1 2 = 8 - 1 2 = 7 2 = 3·2 + 1 2 = 3 / 1 2 = 3.5
3 1 2 ×3 1 2 = 1 + 3·2 2 × 1 + 3·2 2 = 7 2 × 7 2 = 7·7 2·2 = 49 4 = 12·4 + 1 4 = 12 1 4 = 12.25
-21 1 4 + 12 1 4 = 12 1 4 - 21 1 4 = 1 + 12·4 4 - 1 + 21·4 4 = 49 4 - 85 4 = 49 - 85 4 = - 36 4 = - 9 · 4 4 = - 9 = -9