展开全部
3.3x6.6
=3.3x6十3.3X0.6
=19.8十1.98
=21.78
9.9x7.8
=(10一0.1)x7.8
=10X7.8一0.1x7.8
=78一0.78
=77.22
=3.3x6十3.3X0.6
=19.8十1.98
=21.78
9.9x7.8
=(10一0.1)x7.8
=10X7.8一0.1x7.8
=78一0.78
=77.22
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展开全部
3.3×6.6+9.9×7.8
=3.3(3×2.2)+9.9×7.8
=9.9×2.2+9.9×7.8
=9.9(2.2+7.8)
=9.9×10
=99
=3.3(3×2.2)+9.9×7.8
=9.9×2.2+9.9×7.8
=9.9(2.2+7.8)
=9.9×10
=99
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