4638 2X + = X =X=20 X= X = 5X= 5X3 X12 3X= 4x3 9 = 29X= X= 4X6=2X= X = X21=4 X+X=1056X5 =13.4 X-X= X X= XX121 x + x = 4 X=X=12 X= XX=4+0.7X=102 X+X=42 X-X=400 X+X=18 X( + )= XX12x+=4 5 X2.458 x- x -4= 211练题
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