3.6乘31.4+43.9乘6.4=?(一定是简便计算)

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3.6乘31.4+43.9乘6.4=?(一定是简便计算)

3.6乘31.4+43.9乘6.4=?(一定是简便计算)
3.6乘31.4+43.9乘6.4=?(一定是简便计算)

3.6乘31.4+43.9乘6.4=?(一定是简便计算)
=113.04+280.96
=394

原式=3.6×31.4+(31.4+12.5)×6.4
=31.4×(3.6+6.4)+12.5×6.4
=314+12.5×8×0.8
=314+100×0.8
=394

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
=31.4(3.6+6.4)+25/2 * 32/5
=314+80
=394

3.6*31.4+43.9*6.4
=(10-6.4)*31.4+43.9*6.4
=314+(43.9-31.4)*6.4
=314+12.5*6.4
=314+25/2*32/5
=314+80
=394