Question

[tôi thich bạn]

giup mình vơi

Answer 1

[Akira Đang Buồn]

a, X : 3 x 48 + X : 4 x 36 = 1500

    X x \(\dfrac{1}{3}\) x 48 + X x \(\dfrac{1}{4}\) x 36 = 1500

    X x 16 + X x 9 = 1500

    X x ( 16 + 9 ) = 1500

    X x 25 = 1500

    X = 1500 : 25

    X = 60

b, X + 7,5 x X : 5 + X : 2 x 9 = 315

    X + 7,5 x X x \(\dfrac{1}{5}\) + X x \(\dfrac{1}{2}\) x 9 = 315

    X + X x 1,5 + X x 4,5 = 315

    X x ( 1 + 1,5 + 4,5 ) = 315

    X x 7 = 315

    X = 315 : 7

    X = 45