分析:①350-198,根據(jù)減法的運(yùn)算性質(zhì)進(jìn)行簡(jiǎn)算;
②746-103,根據(jù)減法的運(yùn)算性質(zhì)進(jìn)行簡(jiǎn)算;
③346+299,根據(jù)加法的運(yùn)算性質(zhì)簡(jiǎn)算;
④545-167-145,根據(jù)減法的運(yùn)算性質(zhì)進(jìn)行簡(jiǎn)算;
⑤800-138-162,根據(jù)減法的運(yùn)算性質(zhì)進(jìn)行簡(jiǎn)算;
⑥1034+98+66+102,運(yùn)用加法交換律和結(jié)合律進(jìn)行簡(jiǎn)算.
解答:解:①350-198
=350-200+2
=152;
②746-103
=746-100-3
=643;
③346+299
=346+300-1
=645;
④545-167-145
=545-145-167
=400-167
=233;
⑤800-138-162
=800-(138+162)
=800-300
=500;
⑥1034+98+66+102
=(1034+66)+(98+102)
=1100+200
=1300.
點(diǎn)評(píng):此題考查的目的是理解掌握加、減法的運(yùn)算性質(zhì)和加法的運(yùn)算定律,并且能夠靈活運(yùn)用這些運(yùn)算性質(zhì)和運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.