如题所述
第1个回答 2020-07-18
3.9×7.8+2.2×3.9
=3.9×(7.8+2.2)
=3.9×10
=39
=3.9×(7.8+2.2)
=3.9×10
=39
第2个回答 2020-07-18
3.9×7.8加2.2×3.9
=3.9x(7.8+2.2)
=3.9x10
=39本回答被网友采纳
=3.9x(7.8+2.2)
=3.9x10
=39本回答被网友采纳
第3个回答 2020-07-18
3.9×7.8加2.2×3.9,简便计算?
解:3.9×7.8+2.2×3.9
=3.9x(7.8+2.2)
=3.9x10
=39
解:3.9×7.8+2.2×3.9
=3.9x(7.8+2.2)
=3.9x10
=39