用简便方法计算下列各题. 350-198 746-103 346+299 529+102 545-167-145 800-138-162 1
用简便方法计算下列各题.350-198746-103346+299529+102545-167-145800-138-1621034+98+66+102....
用简便方法计算下列各题. 350-198 746-103 346+299 529+102 545-167-145 800-138-162 1034+98+66+102.
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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.
=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.
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