谁知道0.21*6.4+0.42*1.8的简便计算
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![谁知道0.21*6.4+0.42*1.8的简便计算](/uploads/image/z/66883-67-3.jpg?t=%E8%B0%81%E7%9F%A5%E9%81%930.21%2A6.4%2B0.42%2A1.8%E7%9A%84%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
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谁知道0.21*6.4+0.42*1.8的简便计算
谁知道0.21*6.4+0.42*1.8的简便计算
谁知道0.21*6.4+0.42*1.8的简便计算
0.21*6.4+0.24*1.8
=0.21*6.4+0.21*2*1.8
=0.21*6.4+0.21*3.6
=0.21*(6.4+3.6)
=0.21*10
=2.1
0.21*6.4+0.21*2*1.8=0.21*(6.4+3.6)=2.1
0.21*6.4+0.42*1.8
=0.21*(6+0.4)+0.42*(2-0.2)
=0.21*6+0.21*0.4+0.42*2-0.42*0.2
=1.26+0.084+0.84-0.084
=2.1