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简便计算.632+298653-1031763-498204+451397-73-39772+134+28256-199-19873-99+27-1.

题目详情
简便计算.
632+298
653-103
1763-498 204+45
1397-73-397 72+134+28
256-199-19 873-99+27-1.
▼优质解答
答案和解析
①632+298
=632+300-2
=932-2
=930;

②653-103
=653-100-3
=553-3
=550;

③1763-498
=1763-500+2
=1263+2
=1265;

④204+45
=204+40+5
=244+5
=249;

⑤1397-73-397
=1397-397-73
=1000-73
=927;

⑥72+134+28
=(72+28)+134
=100+134
=234;

⑦256-199-19
=256-200-20+2
=36+2
=38;

⑧873-99+27-1
=873+27-(99+1)
=900-100
=800.