42+(3x+7):2=2^5+3^4
42+(3x+7):2=32+81
42+(3x+7):2=113
(3x+7):2=113-42
(3x+7):2=71
3x+7=71x2
3x+7=142
3x=142:7
3x=142/7
x=142/7:3
x=142/21
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tim so nguyen x thoa man -2(3x + 2)=1^2 + 2^2 + 3^2
Tim cac cap x;y thoa man:
a) (x-3).(2.y+1)=5
b) xy+3x-7y=21
c) xy+3x-2y=11
tim x nguyen thoa man 2.x/5=4/10
Tim x biet:
(2x-1)5=(2x-1)7
Tim cac so nguyen to x , y thoa man:
(x-2)2.(y-3)2=4
trinh bay cach lam nhe
tim x thoa man: -12(x-5)+7(3-x)=5
Tim x thoa man : -12.(x-5)+7.(3-x0) =5 .
tim x
42 +( 3x + 7) :2 = 25 + 34
tim x thoa man -12*(x-5)+7*(3-x)=5
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