4.2*4.2+0.42*58+42 用简便方法

2024-11-22 16:53:44
推荐回答(4个)
回答1:

4.2*4.2+0.42*58+42
=4.2×4.2+4.2×5.8+42
=4.2×(4.2+5.8)+42
=4.2×10+42
=42+42
=84

回答2:

4.2*4.2+0.42*58+42
=4.2*4.2+4.2*5.8 + 4.2*10
=4.2*(4.2+5.8+10)
=4.2*20
=84

回答3:

4.2*4.2+0.42*58+42
=4.2*4.2+4.2*5.8+42
=4.2*(4.2+5.8)+42
=42+42
=84

回答4:

4.2*4.2+0.42*58+42
=4.2*4.2+4.2*5.8+4.2*10
=4.2*(4.2+5.8+10)
=4.2*20
=84