3.5×1又1/4+1.25×2又7/10+3.8÷4/5 = = = = = 谢谢了
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3.5×1又1/4+1.25×2又7/10+3.8÷4/5
=3.5×1.25+1.25×2.7+3.8×5/4
=3.5×1.25+1.25×2.7+3.8×1.25
=（3.5+2.7+3.8）×1.25
=10×1.25
=12.5
=3.5×1.25+1.25×2.7+3.8×5/4
=3.5×1.25+1.25×2.7+3.8×1.25
=（3.5+2.7+3.8）×1.25
=10×1.25
=12.5
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3.5×1又1/4+1.25×2又7/10+3.8÷4/5
=3.5×1.25+1.25×2.7+3.8×5/4
=3.5×1.25+1.25×2.7+3.8×1.25
=1.25×(3.5+2.7+3.8)
=1.25×10
=12.5
=3.5×1.25+1.25×2.7+3.8×5/4
=3.5×1.25+1.25×2.7+3.8×1.25
=1.25×(3.5+2.7+3.8)
=1.25×10
=12.5
追答
抱歉题抄错了，重答一下
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3.5×1又1/4+1.25×2又7/10+3.8÷4/5 = = = = = 谢谢了
=7/2x5/4+5/4x27/10+19/5x5/4
=5/4x（7/2+27/10+19/5）
=5/4x（35/10+27/10+38/10）
=5/4x10
=25/2
=12.5
=7/2x5/4+5/4x27/10+19/5x5/4
=5/4x（7/2+27/10+19/5）
=5/4x（35/10+27/10+38/10）
=5/4x10
=25/2
=12.5
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