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精品文档,仅供学习与交流,如有侵权请联系网站删除 5- =+ = 2 + = = - = - + + = + = + = += -= 1 + = 1= = + = = = + = 1 = + = - = = = + + 1= - = + = + = + = 1 5= 5=四、计算下面各题,能简算的要简算。 + - = - + =+ - + ) + 10 - () () 6() - + 25 - - + - - ( - ) 5 + + +() 2 + 1 1= = + + += () 3 - - - 1 1= 4() 2- - 0.8+0.2 ( ) () 2 3(- ) 6() + -(- ) + -(+ ) + - + + + + + 1 + + +- 5 () 3(+ ) () 2= () () 10() + + = (+)() 解方程 + x = X= X + = x = x + = = X= + + x = x +( + )=2 X= 2X=1- 3x29 =19 x = x - = = X 4x - =2- 3x142 11 -x x= x - x= X 【精品文档】第 4 页