巧算以下各题,要求计算过程.分别怎么做?
1个回答
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947+372-447-572
=(947-447)-(572-372)
=500-200
=300
397-146+288-339
=(400-3)+(300-12)-(146+339)
=(400+300)-(3+12)-485
=700-15-485
=700-500
=200
698-154+269+787
=(698+2)+(269+31)+(787+13)-(154+2+31+13)
=700+300+800-200
=1600
=(947-447)-(572-372)
=500-200
=300
397-146+288-339
=(400-3)+(300-12)-(146+339)
=(400+300)-(3+12)-485
=700-15-485
=700-500
=200
698-154+269+787
=(698+2)+(269+31)+(787+13)-(154+2+31+13)
=700+300+800-200
=1600
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还有6道题没解
追答
567+558+562+555+563
=(567+563)+(558+562)+555
=1130+1120+555
=2250+555
=2805
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