Math problems in the fifth grade of primary school: equation oral calculation; 9x-6x = 3.9。 He asked how much x =. Please be specific, that is to say clearly.
Minus-Minus = quotient, such as 7-5=2, which is the same as 9X-6X=3.9; 9-6=3; Such as 3 * 6 =18; Divide the multiplier by 18 divided by 3=6 and = 3X 3X = 3.93.9 divided by 3 equals 65438. X= 1.3 .