如题所述
第1个回答 2016-12-18
3.09x3.9÷2.6
=3.09x1.3x3÷1.3÷2
=3.09x3÷2
=1.545x3
=4.635本回答被网友采纳
=3.09x1.3x3÷1.3÷2
=3.09x3÷2
=1.545x3
=4.635本回答被网友采纳
第2个回答 2016-12-18
3.9÷2.6=3/2. 则3.09x3/2=4.635
第3个回答 2016-12-18
=3.09x3x1.3÷(1.3x2)
=3.09x3÷2
=9.27÷2
=4.635
=3.09x3÷2
=9.27÷2
=4.635