51-[26.5×0.375-(8.3-數(shù)學(xué)公式)+A÷數(shù)學(xué)公式數(shù)學(xué)公式=50,A=________.

4.5
分析:此題實際上就是解關(guān)于未知數(shù)A的方程,在解方程時,根據(jù)等式的性質(zhì)解答即可.
解答:51-[26.5×0.375-(8.3-)+A÷=50,
[9.9375-8.3+7.925)+A×=1,
[9.5625+A×=1,
[9.5625+A××=1×,
9.5625+A×=,
=11.25-9.5625,
A×0.375=1.6875,
A=4.5.
故答案為:4.5.
點評:此題計算量較大,應(yīng)認(rèn)真仔細(xì).在解方程時,依據(jù)等式的性質(zhì),在等式兩邊同加上或同減去、同乘上或同除以同一個數(shù),等式仍相等.
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