Умножение
2/3 * 9/10=(2*9) /(3*10)=
=3/5
при делении дробь переворачиваем и будет умножение
4/5 * 15/2 =(4*15)/(5*2)=
=2*3=6
сложение
3/5 + 6=(3+30)/5=33/5=6.6
![5)+\left \{ {{4x^{2}+y=9 } \atop {8x^{2}-y=3 }} \right.\\ --------\\12x^{2}=12\\\\x^{2}=1\\\\x_{1} =-1\\\\x_{2}=1](https://tex.z-dn.net/?f=5%29%2B%5Cleft%20%5C%7B%20%7B%7B4x%5E%7B2%7D%2By%3D9%20%7D%20%5Catop%20%7B8x%5E%7B2%7D-y%3D3%20%7D%7D%20%5Cright.%5C%5C%20--------%5C%5C12x%5E%7B2%7D%3D12%5C%5C%5C%5Cx%5E%7B2%7D%3D1%5C%5C%5C%5Cx_%7B1%7D%20%3D-1%5C%5C%5C%5Cx_%7B2%7D%3D1)
![\left \{ {{x=-1} \atop {y=9-4*(-1)^{2} }} \right. \\\\\left \{ {{x=-1} \atop {y=5}} \right.\\\\\left \{ {{x=1} \atop {y=9-4*1^{2} }} \right.\\\\\left \{ {{x=1} \atop {y=5}} \right.](https://tex.z-dn.net/?f=%5Cleft%20%5C%7B%20%7B%7Bx%3D-1%7D%20%5Catop%20%7By%3D9-4%2A%28-1%29%5E%7B2%7D%20%7D%7D%20%5Cright.%20%5C%5C%5C%5C%5Cleft%20%5C%7B%20%7B%7Bx%3D-1%7D%20%5Catop%20%7By%3D5%7D%7D%20%5Cright.%5C%5C%5C%5C%5Cleft%20%5C%7B%20%7B%7Bx%3D1%7D%20%5Catop%20%7By%3D9-4%2A1%5E%7B2%7D%20%7D%7D%20%5Cright.%5C%5C%5C%5C%5Cleft%20%5C%7B%20%7B%7Bx%3D1%7D%20%5Catop%20%7By%3D5%7D%7D%20%5Cright.)
Ответ : (- 1 ; 5) , (1 ; 5)
![6)+\left \{ {{3x^{2}+y=4 } \atop {2x^{2}-y=1 }} \right.\\\\-------\\5x^{2}=5\\\\x^{2}=1\\\\x_{1}=-1\\\\x_{2}=1\\\\y_{1}=4-3*(-1)^{2}=1\\\\y_{2}=4-3*1^{2} =1](https://tex.z-dn.net/?f=6%29%2B%5Cleft%20%5C%7B%20%7B%7B3x%5E%7B2%7D%2By%3D4%20%7D%20%5Catop%20%7B2x%5E%7B2%7D-y%3D1%20%7D%7D%20%5Cright.%5C%5C%5C%5C-------%5C%5C5x%5E%7B2%7D%3D5%5C%5C%5C%5Cx%5E%7B2%7D%3D1%5C%5C%5C%5Cx_%7B1%7D%3D-1%5C%5C%5C%5Cx_%7B2%7D%3D1%5C%5C%5C%5Cy_%7B1%7D%3D4-3%2A%28-1%29%5E%7B2%7D%3D1%5C%5C%5C%5Cy_%7B2%7D%3D4-3%2A1%5E%7B2%7D%20%3D1)
Ответ : (- 1 ; 1) , (1 ; 1)
![7)+\left \{ {{2x^{2}+ y=4} \atop {4x^{2}-y=2 }} \right.\\ --------\\6x^{2} =6\\\\x^{2}=1\\\\x_{1}=-1\\\\x_{2}=1\\\\y_{1} =4-2*(-1)^{2}=2\\\\y_{2}=4-2*1^{2}=2](https://tex.z-dn.net/?f=7%29%2B%5Cleft%20%5C%7B%20%7B%7B2x%5E%7B2%7D%2B%20y%3D4%7D%20%5Catop%20%7B4x%5E%7B2%7D-y%3D2%20%7D%7D%20%5Cright.%5C%5C%20--------%5C%5C6x%5E%7B2%7D%20%3D6%5C%5C%5C%5Cx%5E%7B2%7D%3D1%5C%5C%5C%5Cx_%7B1%7D%3D-1%5C%5C%5C%5Cx_%7B2%7D%3D1%5C%5C%5C%5Cy_%7B1%7D%20%3D4-2%2A%28-1%29%5E%7B2%7D%3D2%5C%5C%5C%5Cy_%7B2%7D%3D4-2%2A1%5E%7B2%7D%3D2)
![8)+\left \{ {{5x^{2}+y=12 } \atop {9x^{2}-y=2 }} \right.\\ --------\\14x^{2}=14\\\\x^{2}=1\\\\x_{1}=-1\\\\x_{2}=1\\\\y_{1}=12-5*(-1)^{2}=7\\\\y_{2}=12-5*1^{2}=7](https://tex.z-dn.net/?f=8%29%2B%5Cleft%20%5C%7B%20%7B%7B5x%5E%7B2%7D%2By%3D12%20%7D%20%5Catop%20%7B9x%5E%7B2%7D-y%3D2%20%7D%7D%20%5Cright.%5C%5C%20--------%5C%5C14x%5E%7B2%7D%3D14%5C%5C%5C%5Cx%5E%7B2%7D%3D1%5C%5C%5C%5Cx_%7B1%7D%3D-1%5C%5C%5C%5Cx_%7B2%7D%3D1%5C%5C%5C%5Cy_%7B1%7D%3D12-5%2A%28-1%29%5E%7B2%7D%3D7%5C%5C%5C%5Cy_%7B2%7D%3D12-5%2A1%5E%7B2%7D%3D7)
Ответ : (- 1 ; 7) , ( 1 ; 7)
<span>Вычислить значение выражения
1) 3*4/10*5/10000=60/10000=0.0006
2) -4/10*6/10*(-25/6)=600/600=1
</span><span>Найти значение выражений^
</span>1)Первое действие - деление
0.3/1=0.3
3/10+1/9=72-10/90=62/90=31/45 (Но так как ответ некрасивый, я понял, что 1+1/9 -это значения знаменателя дроби)
1+1/9=9/9+1/9=10/9
3/10*9/10=27/100
2) 8/10*9/8=9/10
3) 1/5-1/30=6-1/30=5/30=1/6
1*6/1=6
4) 1/30+1/42=7+5/210=12/210=6/105
1*105/6=17.5
5) 40/11/(2/11+42/19)
2/11+42/19=38+463/209=501/209
40/11*209/501= 8360/5511=1.52
6√32+4√72 =<span>6√(16*2)+4√(36*2) = 6*4</span>√2+4*6√2=48√2