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1、计算下面各题,能简便运算的要简便运算。+ + 1 + -(-) -(+) + - - + 1 -( + ) + + + + + 1 - - + ( - ) - + + 2、解方程+ X = 1 X = X+ = X - = 2X + 7X = 4.5 3X - 2 = 4 X - ( + ) = 3X+ 4X= 5.67 x= x= x=x= 3x=5 2x=1x+ x- +x= 12x-9x=8.7 9x-4x=6.5 x-=x= x= x=x= 3x=5 2x=15218 x = + x = 12x 9x = 8.72x + 1 = 5 3x x = 0.9 x = 3 x x = 0.9 x = x = x 56 = 19 12 + x = 56 12x 9x = 8.72x + 1 = 5 3x x = 0.9x + = 3x+ 4x= 5.67 13a-5a=3