2.9+29*19+0.29*80+0.1*199=?简便运算.*这个号是乘号.
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![2.9+29*19+0.29*80+0.1*199=?简便运算.*这个号是乘号.](/uploads/image/z/1768386-66-6.jpg?t=2.9%2B29%2A19%2B0.29%2A80%2B0.1%2A199%3D%3F%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97.%2A%E8%BF%99%E4%B8%AA%E5%8F%B7%E6%98%AF%E4%B9%98%E5%8F%B7.)
2.9+29*19+0.29*80+0.1*199=?简便运算.*这个号是乘号.
2.9+29*19+0.29*80+0.1*199=?简便运算.*这个号是乘号.
2.9+29*19+0.29*80+0.1*199=?简便运算.*这个号是乘号.
2.9+29*19+0.29*80+0.1*199=2.9*(1+190+8)+0.1*199=2.9*199+0.1*199=199*(2.9+0.1)=199*3
=(200-1)*3=600-3=597
2.9+29*19+0.29*80+0.1*199
=2.9+2.9*190+2.9*8+0.1*199
=2.9*(1+190+8)+0.1*199
=2.9*199+0.1*199
=(2.9+0.1)*199
=3*199
=3*(200-1)
=3*200-3
=600-3
=597
2.9+29*19+0.29*80+0.1*199
=2.9+2.9X8+29X19+0.1X199
=2.9X(1+8)+29X19+0.1X199
=2.9X9+2.9X190+0.1X199
=2.9X199+0.1X199
=199X(2.9+0.1)
=199X3
=(200-1)X3
=200X3-3
=600-3
=597
2.9+29*19+0.29*80+0.1*199=2.9+2.9*8+2.9*190+0.1*199=2.9*(1+8+190)+0.1*199=199*3=(200-1)*3=597
2.9+(30-1)*(30-1)+(0.3-0.01)*80+0.1*(200-1)=597
2.9+29*19+0.29*80+0.1*199=2.9+2.9*190+2.9*8+0.1*199=2.9*(1+190+8)+0.1*199=2.9*199+0.1*199=(2.9+0.1)*199=3*199=3*(200-1)=600-3=597