2.6x7.4+0.26x25+0.26x10
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2.6×7.4+0.26×25+0.26×10
=0.26×74+0.26×25+0.26×10
=0.26×（74+25）+2.6
=0.26×99+2.6
=0.26×100-0.26+2.6
=26-0.26+2.6
=28.34
=0.26×74+0.26×25+0.26×10
=0.26×（74+25）+2.6
=0.26×99+2.6
=0.26×100-0.26+2.6
=26-0.26+2.6
=28.34
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