1994.5*79+0.24*790+244.9:

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1994.5*79+0.24*790+244.9:1994.5*79+0.24*790+244.9:1994.5*79+0.24*790+244.9:原式=1994.2*79+2.4*79+3.1*7

1994.5*79+0.24*790+244.9:
1994.5*79+0.24*790+244.9

1994.5*79+0.24*790+244.9:
原式=1994.2*79+2.4*79+3.1*79
=(1994.2+2.4+3.1)*79
=2000*79
=2000*80-2000
=160000-2000
=158000

79*(1994.5+2.4)+244.9=
79*1996.9+244.9

158000

=19945*7.9+24*7.9+31*7.9
=7.9(19945+24+31)
=7.9*20000
=158000

原式=1994.5*79+2.4*79+3.1*79=(1994.5+2.4+3.1)*79=2000*79=158000

等于158000