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递等式计算.777×9+111×37       

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/07/16 14:15:47
递等式计算.
777×9+111×37                  
9+3÷7÷6×14             
60×(1-
1
3
(1)777×9+111×37
=111×63+111×37
=111×(63+37)
=111×100
=11100;
                  
(2)9+3÷7÷6×14
=9+3×14÷7÷6 
=9+42÷7÷6 
=9+1
=10;
         
(3)60×(1-
1
3-0.5)
=60×1-60×
1
3-60×0.5
=60-20-30
=10;
(4)1.26÷0.4÷31.5
=1.26÷(0.4×31.5)
=1.26÷12.6
=0.1;
(5)[34-(
1
5+
1
3)×30]÷
3
5
=[34-(
1
5×30+
1
3×30)]÷
3
5
=[34-(6+10)]÷
3
5
=[34-16]÷
3
5
=18×
5
3
=30.