问题
解答题
口算.
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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. |