3.6*31.4+43.9*6.4怎样简便运算
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3.6*31.4+43.9*6.4怎样简便运算
3.6*31.4+43.9*6.4怎样简便运算
3.6*31.4+43.9*6.4怎样简便运算
(1)用计算器是铁定简单的.
(2)3.6*31.4+43.9*6.4
=3.6*(43.9-12.5)+43.9*6.4
=439-3.6*12.5
=394
3.6*31.4+43.9*6.4=3.6*31.4+(12.5+31.4)*6.4=31.4*(3.6+6.4)+12.5*6.4=314+80=394
394 =113.04 280.96 =394 3.6乘31.4 43.9乘6.4 =3.6*31.4 (31.4 12.5)*6.4 =3.6*31.4 31.4*6.4 12.5*6.4 =31.