2个回答
2016-09-19
展开全部
9.9x9.9+0.99
=(10-0.1)x(10-0.1)+0.99
=10x10-10x0.1-0.1x10+0.1x0.1+0.99
=100-1-1+0.01+0.99
=100-2+1
=99
=(10-0.1)x(10-0.1)+0.99
=10x10-10x0.1-0.1x10+0.1x0.1+0.99
=100-1-1+0.01+0.99
=100-2+1
=99
2016-09-19
展开全部
9.9×9.9+0.99
=99×0.99+0.99
=0.99×(99+1)
=0.99×100
=99
=99×0.99+0.99
=0.99×(99+1)
=0.99×100
=99
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