Question

4.9×4.9+0.49×51用简便计算？

Answer 1

简便计算，先凑出相同项4.9，然后在利用乘法分配律合并同类项，详细计算过程如下：
4.9 x4.9 +0.49 x51
=4.9x4.9+4.9x5.1
=4.9x( 4.9+5.1)
=4.9×10
​=49

Answer 2

4.9×4.9+0.49×51
=0.49×49+0.49×51
=0.49（49+51）
=0.49x100
=49

Answer 3

先提出4.9，再化简计算：
4.9×4.9+0.49×51
=4.9×4.9+0.49×51
=4.9×4.9+4.9×5.1
=4.9×(4.9+5.1)
=4.9×10
=49