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KP
1
30 tháng 6 2023
2:
căn c+25=34
=>căn c=9
=>c=81
=>c^2-28=81^2-28=6533
3: xy-3x+y=14
=>x(y-3)+y-3=11
=>(y-3)(x+1)=11
=>(x+1;y-3) thuộc {(1;11); (11;1); (-1;-11); (-11;-1)}
=>(x,y) thuộc {(0;14); (10;4); (-2;-8); (-12;2)}
4:
TH1: AC=5cm
AB+AC<BC
=>Loại
TH2: AC=11cm
BC+AC>AB; BC+AB>AC; AB+AC>BC
=>Nhận
C ABC=11+11+5=27(cm)
NN
30 tháng 10 2021
bạn làm mik thấy hợp lí
tui sắp thi Toán rồi ,chắc tui ngất qá 
27 tháng 8 2017
1^3-3^5-(-3^5)+1^64-2^9-1^36+1^15
=1+(-3^5+3^5)+1-2^9-1+1
=2-2^9
=-510
HQ
2
17 tháng 7 2017
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7 tháng 12 2019
gọi (d) y=x
Thay x=1=>y=1=> (1;1)
Thay x=2=>y=2=> (2;2)
gọi (d1) y=-2x
Thay x=-1=> y=2=> (-1;2)
Thay x=1=>y=-2=> (1;-2)
KK
7
MM
18 tháng 5 2018
1000+ 2000= 3000
Mik đầu tiên
Mik chọn quà 1, bạn k cho mik nha
\(\sqrt{2x+5}=11\Leftrightarrow2x+5=11^2\)
=> 2x + 5 = 121
=> 2x = 121 - 5 = 116
=> x = 58
\(\sqrt{2x+5}=11\)
\(\Leftrightarrow2x+5=11^2=121\)
\(\Leftrightarrow2x=121-5=116\)
\(\Leftrightarrow x=\frac{116}{2}=58\)