0.79ⅹ6.9+0.69x2.2-6.9的简便方法?
3个回答
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0.79ⅹ6.9+0.69x2.2-6.9
=0.79ⅹ6.9+6.9×0.22-6.9
=6.9×(0.79+0.22-1)
=6.9×(1.01-1)
=6.9×0.01
=0.069
=0.79ⅹ6.9+6.9×0.22-6.9
=6.9×(0.79+0.22-1)
=6.9×(1.01-1)
=6.9×0.01
=0.069
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展开全部
0.79×6.9+0.69×2.2-6.9
=0.79×6.9+6.9×0.22-6.9
=6.9×(0.79+0.22-1)
=6.9×0.01
=0.069
=0.79×6.9+6.9×0.22-6.9
=6.9×(0.79+0.22-1)
=6.9×0.01
=0.069
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0.69×(7.9+2.2-10)
0.69×0.1
0.069
0.69×0.1
0.069
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