分析:根據(jù)加法交換律、加法結(jié)合律和加、減法的運(yùn)算性質(zhì)進(jìn)行簡(jiǎn)算.
解答:解:①137+86+63,
=(137+63)+86,
=200+86,
=286;
②254+(524+146),
=524+(254+146),
=524+400,
=924;
③262-186-14,
=262-(186+14),
=262-200,
=62;
④381-199,
=381-200+1,
=182;
⑤228+107,
=228+100+7,
=335;
⑥323-(223+65),
=323-223-65,
=35;
⑦178+297,
=178+300-3,
=475;
⑧168+249+132+451,
=(168+132)+(249+451),
=300+700,
=1000;
⑨694+238-594,
=694-594+238,
=100+238,
=338.
點(diǎn)評(píng):此題考查的目的是理解掌握加法的運(yùn)算定律和加、減法的運(yùn)算性質(zhì),并且能夠靈活運(yùn)用這些運(yùn)算定律和運(yùn)算性質(zhì)進(jìn)行簡(jiǎn)便計(jì)算.