问题 解答题

947+(372-447)=

284+198=

998+3+99+998+3+9=

958-596=

85+41+15+59=

34+304+3004=

答案

(1)947+(372-447)

=947-447+372

=500+372

=872;

(2)284+198

=284+200-2

=484-2

=482;

(3)998+3+99+998+3+9

=(998+2)+(1+99)+(998+2)+(1+9)

=1000+100+1000+10

=2110;

(4)958-596

=958-600+4

=358+4

=362;

(5)85+41+15+59

=(85+15)+(59+41)

=100+100

=200;

(6)34+304+3004

=30+300+3000+4+4+4

=3330+12

=3342.

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