7.8乘99的简便计算

2024-11-22 08:05:12
推荐回答(4个)
回答1:

7.8×99
=7.8×(100-1)
=7.8×100-7.8×1
=780-7.8
=780-(10-2.2)
=780-10+2.2
=770+2.2
=772.2

回答2:

7.8x99
=7.8x(100-1)
=7.8x100-7.8
=780-7.8
=772.2

回答3:

7.8×99
=7.8×(100-1)
=7.8×100-7.8×1
=780-7.8
=772.2

回答4:

7.8*100-7.8+0.78
=780-7.8+0.78
=772.2+0.78
=7720.98