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\(a,\left(2600+6400\right)-3\times x=1200\)
\(9000-3\times x=1200\)
\(3\times x=9000-1200\)
\(3\times x=7800\)
\(x=7800:3\)
\(x=2600\)
\(b,\left[\left(6\times x-72\right):2-84\right]\times28=5628\)
\(\left(6\times x-72\right):2-84=5628:28\)
\(\left(6\times x-72\right):2-84=201\)
\(\left(6\times x-72\right):2=201+84\)
\(\left(6\times x-72\right):2=285\)
\(6\times x-72=285\times2\)
\(6\times x-72=570\)
\(6\times x=570+72\)
\(6\times x=642\)
\(x=107\)
\(c,2x-138=2^3:3^2\)
\(2x-138=\frac{8}{9}\)
\(2x=\frac{8}{9}+138\)
\(2x=\frac{1250}{9}\)
\(x=\frac{1250}{9}:2\)
\(x=\frac{625}{9}\)
\(d,42x=39\times42-37\times42\)
\(42x=42\times\left(39-37\right)\)
\(42x=42\times2\)
\(42x=84\)
\(x=2\)
\(-15.\left(\chi+2\right)+7.\left(2\chi-3\right)=\left(-5\right).10\)
\(\Rightarrow-15\chi+\left(-30\right)+14\chi-21=-50\)
\(\Rightarrow\left(-15\chi+14\chi\right)=-50+30+21\)
\(\Rightarrow\chi=1\)
HTDT
13 - l x + 5 l = 13
\(\Rightarrow\)l x + 5 l = 13 -13
\(\Rightarrow\)l x + 5 l = 0
\(\Rightarrow\)x + 5 = 0
\(\Rightarrow\)x = 0 - 5
\(\Rightarrow\)x = -5
Ta có: 13 - | x + 5 | = 13
\(\Rightarrow\left|x+5\right|=13-13\)
\(\Rightarrow\left|x+5\right|=0\Rightarrow x+5=0\)
\(\Rightarrow x=-5\)
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ai giup minh k cho,nho lam ro ra nhe,minh rat gap hu hu hu....
\(5x+\frac{9}{240}=\frac{39}{40}\)
\(5x=\frac{15}{16}\)
\(x=\frac{3}{16}\)
5x + \(\frac{9}{240}\)= \(\frac{39}{40}\)
5x = \(\frac{39}{40}\)- \(\frac{9}{240}\)
5x = \(\frac{15}{16}\)
x= \(\frac{15}{16}\): 5
x = \(\frac{3}{16}\)
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