(1)x+15%x=230, (1+15%)x=230,1.15x=230, 1.15x÷1.15=230÷1.15,
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(1)x+15%x=230, (1+15%)x=230,1.15x=230, 1.15x÷1.15=230÷1.15, x=200;(2)x+ x 6 =420,(1+ 1 6 )x=420, 7 6 x=420, 7 6 x× 6 7 =...
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