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简介:
(1)723-251+177
=(723+177)-251
=900-251
=649
(2)872+284-272
=872-272+284
=600+284
=884
(3)537-142-58
=537-(142+58)
=537-200
=337
(4)321+(279-155)
=321+279-155
=600-155
=445
(5)372-(54+72)
=372-72-54
=300-54
=246
(6)432-(154-68)
=432+68-154
=500-154
=346
(7)1472-86-114
=1472-(86+114)
=1472-200
=1272
(8)38+129+71
=38+(129+71)
=38+200
=238