3.3x6.6 9.9x7.8简便计算?

咋做?
2024-11-07 23:35:46
推荐回答(2个)
回答1:

3.3x6.6
=3.3x6十3.3X0.6
=19.8十1.98
=21.78
9.9x7.8
=(10一0.1)x7.8
=10X7.8一0.1x7.8
=78一0.78
=77.22

回答2:

3.3×6.6+9.9×7.8
=3.3(3×2.2)+9.9×7.8
=9.9×2.2+9.9×7.8
=9.9(2.2+7.8)
=9.9×10
=99