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通分计算,在算式的下面写上通分过程 - = - + + = =- + + + 2 = 1 - = = = = = = = = 1 = = = = = = = = = = = = = = = 7= += =+= = 5= 5- = 1-=+ = + = 2 + = 0.25= = 脱式计算: + - - + + - + + 10 - () () () 6() - ( + ) + + - + 25 - - + - - ( - ) 解方程 2x+4.625 + x = X= X + = x = x + = = X= + + x = x +( + )=2 X= 2X=1- x = x - = = X 4x - =2-