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\(\left[3^4-\left(8^2+14\right):13\right]\cdot x=5^3+10^2\)
\(\Rightarrow\left[81-\left(64+14\right):13\right]\cdot x=125+100\)
\(\Rightarrow\left(81-78:13\right)\cdot x=225\)
\(\Rightarrow\left(81-6\right)\cdot x=225\)
\(\Rightarrow75\cdot x=225\)
\(\Rightarrow x=225:75\)
\(\Rightarrow x=3\)
a: \(\Leftrightarrow x=\dfrac{16\cdot6}{4}=24\)
b: \(\Leftrightarrow x=\dfrac{-5\cdot42}{14}=-15\)
c: \(\Leftrightarrow\dfrac{x}{11}=\dfrac{-3}{11}\)
hay x=-3
\(a,14-5+x=30\)
\(\Rightarrow9+x=30\Rightarrow x=30-9\)
\(\Rightarrow x=21\)
\(b,45-\left(3+x\right)=14\)
\(\Rightarrow3+x=45-14\)
\(\Rightarrow3+x=31\Rightarrow x=31-3\)
\(\Rightarrow x=28\)
\(c,18+\left(-3+x\right)-\left(44-x\right)=55\)
\(\Rightarrow18-3+x-44+x=55\)
\(\Rightarrow2x-29=55\Rightarrow2x=55+29\)
\(\Rightarrow2x=84\Rightarrow x=84:2\)
\(\Rightarrow x=42\)
\(d,\left(x-45\right).27=0\)
\(\Rightarrow x-45=0\Rightarrow x=45\)
b/ x + (x + 1) + (x + 2) + .... + (x + 30) = 1240
x + (x + x + ....+ x) + (1 + 2 + ... + 30) = 1240
x + 30x + 465 = 1240
31x = 1240 - 465
31x = 775
=> x = 775 : 31 = 25
c/ Sửa đề (x + 4) + (x + 6) + (x + 8) + .... + (x + 26) = 210
(x + x + x + .... + x) + (4 + 6 + 8 + .... + 26) = 210
12x + 180 = 210
12x = 210 - 180 = 30
=> x = 30 : 12 = 2,5
\(A=2016:4+4048:2\\ =504+2024\\ =2528\\ B=37064-64\cdot\left(82+42966:2017\right)\\ =37064-64\cdot\left(82+21,30193356\right)\\ =37064-64\cdot103,3019336\\ =37064-6611,323748\\ =30452,67625\\ C=\left(100+92\cdot42\right)+\left(200-58\right)\cdot58\\ =\left(100+3864\right)+142\cdot58\\ =3964+8236\\ =12200\\ D=\left(1998:18-1443:13\right)\cdot\left(16996-1110:30\cdot305\right)\\ =\left(111-111\right)\cdot\left(16996-1110:30\cdot305\right)\\ =0\cdot\left(16996-1110:30\cdot305\right)\\ =0\)
x=0;1;2;3;4;5;6;7;8;9
y=0