=2008×7.3-6.3×2008
=2008×(7.3-6.3)
=2008×1
=2008;
②9999×2222+3333×3334
=3333×6666+3333×3334
=3333×(6666+3334)
=3333×10000
=33330000;
③(1+
1 |
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99 |
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=
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=
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=
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99 |
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1 |
99 |
1 |
99 |
1 |
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100 |
2×99 |
50 |
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