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What is the ratio of the measure of one angle of a rectangle to the sum of the angles of a rhombus? What type of particle does a formula unit represent? Hitunglah ph larutan 3.7 gram Ca(OH)2 dalam 1 liter air? Solve (x^2+x)y'=(2x+1)y by power series method? 4-Methoxy-4'-methylbiphenyl + br2 and febr3-?