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数学
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如果4a-3b=7,并且3a+2b=19,求14a-2b的值.
人气:357 ℃ 时间:2019-08-28 09:25:05
解答
∵4a-3b=7,并且3a+2b=19,
∴14a-2b=2(7a-b)
=2[(4a+3a)+(-3b+2b)]
=2[(4a-3b)+(3a+2b)]
=2(7+19)
=52,
答:14a-2b的值为52.
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