0.64×25×7.8+2.2
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![0.64×25×7.8+2.2](/uploads/image/z/6082961-41-1.jpg?t=0.64%C3%9725%C3%977.8%2B2.2)
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0.64×25×7.8+2.2
0.64×25×7.8+2.2
0.64×25×7.8+2.2
127
127,没计算器用手机算了
简便算法
0.64×25×7.8+2.2
=16*(7.8+2.2)-16*2.2+2.2
=16*10-(16-1)*2.2
=160-15*2.2
=160-33
=-127
0.64*25*7.8+2.2 =4×0.16×25×7.8+2.2 =(4×25)×0.16=0.16*(4*25)*7.8+2.22=0.16*100*7.8+2.2=16脳7.8+2.2=
0.64×25×7.8+2.2
=0.16×﹙4×25﹚×7.8+2.2
=0.16×100×7.8+2.2
=16×7.8+2.2
=127
0.64+25+7.8+2.2
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