zouti25 апр. 2017, 12:5325.04.1708.02.151-100 But the problem posed is illogicalyou cant have 100-20X50 the right must be (100+(-200))X50
Deleted25 апр. 2017, 12:5925.04.171 май 2017, 11:56(edited)2204703x=90 x= 30 ...(1) 30 -2x=20, 2x=-10, x=5 ....(2)5+ x²=25, x²=20, x=√20=4.472 ....(3)(3) -(2) +(1)= ?2√5-30x5= ?-145.527