You may find that a variable isn't good enough or have a problem where you have to solve for a variable (变量)．__24__ the only real way to assure yourself that the answer you've found is correct.

　　Check for a reasonable answer

　　__25__ For example, if you get an answer in the millions and you know it should be in the thousands, you've likely misplaced a point.Go back through the work on your paper to make sure all of your formulas and calculations are correct.If everything looks okay, do the problem again and compare the result of the second try to what you've got on the first try.

　　A．Do the opposite.

　　B．Correct the answers.

　　C．Plug the variable in the equation (方程) to check it out.d the test.

　　F．If the result of a problem seems to make no sense, it indicates that the answer is incorrect.

　　G．This helps you to know what information you have and what information you need to solve.

　　答案：21～25　DGACF

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