问题
解答题
用简便的方法计算;
①283-47-153 ②842-368-132 ③273-98
④267+153+433 ⑤782-216-184 ⑥472-127-123.
答案
①283-47-153
=283-(47+153)
=283-200
=83;
②842-368-132
=842-(368+132)
=842-500
=342;
③273-98
=273-(100-2)
=273-100+2
=175;
④267+153+433
=267+433+153
=700+153
=853;
⑤782-216-184
=782-(216+184)
=782-400
=382;
⑥472-127-123
=472-(127+123)
=472-250
=222;
故答案为83;342;175;853;382;222.