2.4*1.25*0.3和842.4*6.7+8.24*31+0.824*20的简便运算怎么算
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2.4*1.25*0.3
=0.8*1.25*0.3*0.3
=0.09
842.4*6.7+8.24*31+0.824*20
=84.24*67+8.24*31+8.24*2
=(76+8.24)*67+8.24*33
=76*67+8.24*67+8.24*33
=5092+8.24*100
=5092+824
=5916
=0.8*1.25*0.3*0.3
=0.09
842.4*6.7+8.24*31+0.824*20
=84.24*67+8.24*31+8.24*2
=(76+8.24)*67+8.24*33
=76*67+8.24*67+8.24*33
=5092+8.24*100
=5092+824
=5916
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2.4×1.25×0.3=3×0.8×1.25×0.3=(3×0.3)×(0.8×1.25)=0.9
82.4×6.7+8.24×31+0.824×20=8.24×67+8.24×31+8.24×2=8.24×(67+31+2)=824
82.4×6.7+8.24×31+0.824×20=8.24×67+8.24×31+8.24×2=8.24×(67+31+2)=824
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