3.7×3.7+2×3.7×6.3+6.3×6.3的简便计算
1个回答
2013-10-26
展开全部
原式= (3.7×3.7+3.7×6.3)+(3.7×6.3+6.3×6.3)
=3.7×(3.7+6.3)+6.3×(3.7+6.3)
=3.7×10+6.3×10
=(3.7+6.3)×10
=10×10
=100
=3.7×(3.7+6.3)+6.3×(3.7+6.3)
=3.7×10+6.3×10
=(3.7+6.3)×10
=10×10
=100
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