问题 解答题
口算.
60+30=66-3=75-40=36+23=10+30+52=90-20=
30+48=74-50=54-21=80-50+40=10+40=83+6=
56+40=6+32=25+40-32=43+2=45-20=68-30=
0+40=70+20-60=
答案

60+30=90,66-3=63,75-40=35,36+23=59,10+30+52=92,90-20=70,
30+48=78,74-50=24,54-21=33,80-50+40=70,10+40=50,83+6=89,
56+40=96,6+32=38,25+40-32=33,43+2=45,45-20=25,68-30=38.
0+40=40,70+20-60=30.
故答案为:90,63,35,59,92,70,78,24,33,70,50,89,96,38,33,45,25,38,40,30.

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