8.7×3.5-2.2×3.5+6.5×6.5
=(8.7-2.2)×3.5+6.5×6.5
=6.5×3.5+6.5×6.5
=6.5×(3.5+6.5)
=6.5×10
=65
递等式计算 8.7×3.5-2.2×3.5+6.5×6.5
递等式计算 8.7×3.5-2.2×3.5+6.5×6.5
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要过程
数学人气:151 ℃时间:2019-12-29 15:09:51
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