①782-(534-218)
②786-479+279
③875-(347+375)
④786+479-279
⑤972+52-804-52+804
⑥849-828+528-36-164.
分析:①782-(534-218),根據(jù)減法的運算性質(zhì)進(jìn)行簡算;
②786-479+279,根據(jù)加、減法的運算性質(zhì)進(jìn)行簡算;
③875-(347+375),根據(jù)減法的運算性質(zhì)進(jìn)行簡算;
④786+479-279,根據(jù)加、減法的運算性質(zhì)進(jìn)行簡算;
⑤972+52-804-52+804,根據(jù)加、減法的運算性質(zhì)進(jìn)行簡算;
⑥849-828+528-36-164,根據(jù)加、減法的運算性質(zhì)進(jìn)行簡算;
解答:解:①782-(534-218),
=782+218-534,
=1000-534,
=466;

②786-479+279,
=786-(479-279),
=786-200,
=586;

③875-(347+375),
=875-375-347,
=500-347,
=153;

④786+479-279,
=786+(479-279),
=786+200,
=986;

⑤972+52-804-52+804,
=972+(52-52)+(804-804),
=972+0+0,
=972;

⑥849-828+528-36-164,
=21+528-(36+164),
=549-200,
=349.
點評:此題考查的目的是理解掌握加、減法的運算性質(zhì),并且能夠靈活運用加、減法的運算性質(zhì)進(jìn)行簡便計算.
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