Question

0.64×2.5×78+2.2怎么简算？

Answer 1

这道题不太好用简便计算
具体计算过程如下所示
0.64×2.5×78+2.2
=0.16×4×2.5×78+2.2
=0.16×10×78+2.2
=1.6×78+2.2
=1.6×(80-2)+2.2
=1.6×80-1.6×2+2.2
=128-3.2+2.2
=128-1
=127

Answer 2

0.64x2.5x78+2.2
＝0.8x0.8x2.5x78+2.2
＝0.8x（0.8x2.5）x78+2.2
＝0.8x2x78+2.2
＝1.6x78+2.2
＝124.8+2.2
＝127
结果等于127。

Answer 3

解：0.64x2.5x78+2.2
＝0.8x2.5x0.8x78+2.2
＝2x0.8x78+2.2
＝1.6x78+2.2
＝1.6x（80-2）+2.2
＝128-3.2+2.2
＝124.8+2.2
＝127

Answer 4

0.64*2.5*78+2.2
=0.8*0.8*2.5*78+2.2
=0.8*2*78+2.2
=1.6*78+2.2
=3.2*39+3.2-1
=3.2*40-1
=127

Answer 5

0.64×2.5×78+2.2
=0.16×4×2.5×78+2.2
=0.16×10×78+2.2
=1.6×78+2.2
=124.8+2.2
=127