
3个回答
展开全部
1.9×(0.13+0.77)
=1.9×0.9
=1.9×(1-0.1)
=1.9-0.19
=1.9-0.2+0.01
=1.71
=1.9×0.9
=1.9×(1-0.1)
=1.9-0.19
=1.9-0.2+0.01
=1.71
展开全部
1.9×(0.13+0.77)
=1.9×0.9
=1.9×(1-0.1)
=1.9-0.19
=1.71
=1.9×0.9
=1.9×(1-0.1)
=1.9-0.19
=1.71
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展开全部
=l.9xo.9
=(1+o丶9)×o、9
=o.9+o.8l
=I.7l
=(1+o丶9)×o、9
=o.9+o.8l
=I.7l
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