0.43ⅹ0.3 0.9x4.34 0.007ⅹ43.4怎样简便计算？？？
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把一个变成整数，比访说。0.043x3 9x0.435 7x0.0434
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0.43×0.3+0.9×4.34+0.007×43.4
=0.129+(1-0.1)×4.34+(0.01-0.003)×43.4
=0.129+1×4.34-0.1×4.34+0.01×43.4-0.003×43.4
=0.129+4.34-0.434+0.434-0.1302
=(0.129+4.34-0.1302)+(0.434-0.434)
=0.129+4.34-0.129-0.0012
=(4.34-0.0012)+(0.129-0.129)
=4.3388
=0.129+(1-0.1)×4.34+(0.01-0.003)×43.4
=0.129+1×4.34-0.1×4.34+0.01×43.4-0.003×43.4
=0.129+4.34-0.434+0.434-0.1302
=(0.129+4.34-0.1302)+(0.434-0.434)
=0.129+4.34-0.129-0.0012
=(4.34-0.0012)+(0.129-0.129)
=4.3388
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