计算. (1)9999×2222+3333×3334= (2)98766×98768-98765×98769=
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(1)9999×2222+3333×3334,
=3333×3×2222+3333×3334,
=3333×6666+3333×3334,
=3333×(6666+3334),
=3333×10000,
=33330000.
98766×98768-98765×98769
=(98765+1)×98768-98765×(98768+1),
=98765×98768+98768-(98765×98768+98765),
=98765×98768+98768-98765×98768-98765,
=98768-98765,
=3.
=3333×3×2222+3333×3334,
=3333×6666+3333×3334,
=3333×(6666+3334),
=3333×10000,
=33330000.
98766×98768-98765×98769
=(98765+1)×98768-98765×(98768+1),
=98765×98768+98768-(98765×98768+98765),
=98765×98768+98768-98765×98768-98765,
=98768-98765,
=3.
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