4/9-25x^2=0 ;)))))))))))))))))

2 câu trả lời

4/9-25x^2=0

4/9=25x^2

4/9:25=x^2

4/9.1/25=x^2

4/225=x^2

x=2/15

x=-2/15

49 -25 x2 =0

25 x2 =0+ 49

25 x2 = 49

x2 = 49 :25

x2 = 4225

x= 215

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