tìm a
a x 6 + a =420
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a. 100 + x = 987
x = 987 – 100
x = 887
b. 204 – x = 18 : 6
204 – x = 3
x = 204 – 3
x = 201
c. x × 5 = 450 – 420
x × 5 = 30
x = 30 : 5
x = 6
\(12.\left(x+41\right)=624\)
\(\Leftrightarrow x+41=52\)
\(\Leftrightarrow x=11\)
\(420:\left(3x-6\right)=7\)
\(\Leftrightarrow3x-6=60\)
\(\Leftrightarrow3x=66\)
\(\Leftrightarrow x=22\)
12 . ( x + 41 ) = 624
x + 41 = 624 : 12
x + 41 = 52
x = 52 - 41
x = 11
420 : ( 3 . x-6 ) = 7
3 . x - 6 = 420 : 7
3 . x - 6 = 60
3 . x = 60 + 6
3 . x = 66
x = 66 : 3
x = 22
a)\(2.x-138=8.9\)
\(2.x-138=72\)
\(2.x=72+138\)
\(2.x=210\)
\(x=210\div2\)
\(x=105\)
b)\(\left\{\left(6x-72\right)\div2-84\right\}.28=5628\)
\(\left(6x-72\right)\div2-84=201\)
\(\left(6x-72\right)\div2=285\)
\(6x-72=570\)
\(6x=642\)
\(x=107\)
c)\(420+65.4=\left(x+175\right)\div5+30\)
\(420+260=\left(x+175\right)\div5+30\)
\(680=\left(x+175\right)\div5+30\)
\(650=\left(x+175\right)\div5\)
\(3250=x+175\)
\(3075=x\)
\(Tacó:\)
\(xy=6.UCLN\left(x,y\right)=1\)
\(\Leftrightarrow6=xy=2.3=3.2=1.6=6.1\)
\(+xy=2.3\Rightarrow\left(x,y\right)=1\left(tm\right).Th:xy=3.2\left(tm\right)\)
\(+xy=1.6=6.1\Rightarrow\left(x,y\right)=1\left(tm\right)\)
\(\Rightarrow x,y\in\left\{\left(1;6\right),\left(6;1\right),\left(2;3\right),\left(3;2\right)\right\}\)
ax6+a=420
ax=420
a=420:7
a=60 k nha mình k lại
\(a\times6+a=420\)
\(\Leftrightarrow a\times\left(6+1\right)=420\)
\(\Leftrightarrow a\times7=420\)
\(\Leftrightarrow a=\frac{420}{7}=60\)
Vậy \(a=60\)