2.1*2.6+7.4*5.4+2.6+3.3 等于多少简便计算

题目

2.1*2.6+7.4*5.4+2.6+3.3 等于多少简便计算
0.147*368+0.632*147

答案

2.1*2.6+7.4*5.4+2.6*3.3
=(2.1+3.3)*2.6+7.4*5.4
=5.4*2.6+7.4*5.4
=5.4*(2.67.4)
=5.4*10
=54
0.147*368+0.632*147
=147*0.368+0.632*147
=147*(0.368+0.632)
=147*1
=147