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(1)2000-468-132(2)553-172-153(3)977-(54+77)(4)1738-(731-262)(5)8624-(653+1624)(6)1997+6-(1997-6)(7)400-1-99-98-2-97-3-96-4(8)916-297-98+79(9)1827-311-552-137-78-122.

题目详情
(1)2000-468-132
(2)553-172-153
(3)977-(54+77)
(4)1738-(731-262)
(5)8624-(653+1624)
(6)1997+6-(1997-6)
(7)400-1-99-98-2-97-3-96-4
(8)916-297-98+79
(9)1827-311-552-137-78-122.








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答案和解析
(1)2000-468-132,
=2000-(468+132),
=2000-600,
=1400;

(2)553-172-153,
=553-153-172,
=400-172,
=228;

(3)977-(54+77),
=977-54-77,
=977-77-54,
=900-54,
=846;

(4)1738-(731-262),
=1738-469,
=1269;

(5)8624-(653+1624),
=8624-653-1624,
=8624-1624-653,
=7000-653,
=6347;

(6)1997+6-(1997-6),
=1997+6-1997+6,
=1997-1997+(6+6),
=12;

(7)400-1-99-98-2-97-3-96-4,
=400-(1+99)-(98+2)-(97+3)-(96+4),
=400-100-100-100-100,
=0;

(8)916-297-98+79,
=(900+16)-(200-3)-(100-2)+79,
=900-200-100+(16+3+2+79),
=600-100,
=500;


(9)1827-311-552-137-78-122,
=1827-(311+552+137)-(78+122),
=1827-1000-200,
=627.