3.6*31又2/5+43.9*6又2/5简便运算
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3.6*31又2/5 43.9*6又2/5
=3.6*31.4 43.9*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) 12.5*8*0.8
=31.4*10 100*0.8
=314 80
=394
=3.6*31.4 43.9*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) 12.5*8*0.8
=31.4*10 100*0.8
=314 80
=394
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3.6*31又2/5+43.9*6又2/5（化成小数）
=3.6×（6.4+25）+43.9×6.4
=3.6×6.4+43.9×6.4+3.6×25
=6.4×（3.6+43.9）+90
=6.4×47.5+90
=6.4×（50-2-0.5）+90
=6.4×50-6.4×2-6.4×0.5+90
=320-12.8-3.2+90
=410-（12.8+3.2）
=410-10-6
=394
=3.6×（6.4+25）+43.9×6.4
=3.6×6.4+43.9×6.4+3.6×25
=6.4×（3.6+43.9）+90
=6.4×47.5+90
=6.4×（50-2-0.5）+90
=6.4×50-6.4×2-6.4×0.5+90
=320-12.8-3.2+90
=410-（12.8+3.2）
=410-10-6
=394
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