Question

a) x : y = 20 : 9.

b) 6 : x = 6,5 : ( -29,25 ).          c) ( 1 - x )^3 : ( - 0,5625 ) = 0,525 : 0,7                                 Giúp e với ạ . E cảm ơn .

Answer 1

\(a.x:y=20:9\\ < =>\dfrac{x}{y}=\dfrac{20}{9}\\ < =>x=\dfrac{20}{9}y\\ b.6:x=6,5:\left(-29,25\right)\\ < =>6:x=\dfrac{2}{9}\\ < =>x=6:\dfrac{2}{9}\\ < =>x=27\\ c.\left(1-x\right)^3:\left(-0,5625\right)=0,525:0,7\\ < =>\left(1-x\right)^3:\left(-0,5625\right)=0,75\\ < =>\left(1-x\right)^3=0,75\cdot\left(-0,5625\right)\\ < =>\left(1-x\right)^3=-0,421875\\ < =>\left(1-x\right)^3=\left(-0,75\right)^3\\ < =>1-x=-0,75\\ < =>x=1+0,75\\ < =>x=1,75\)