3.脱式计算.
| 480-80÷5 | 540÷(27+18) | 230×3-490÷7 |
| 5+360÷(20-5) | (42+38)×5÷25 | 495÷[15×(15÷5)] |
2.有一个数,它的3倍比它的7倍小84,求这个数是多少?正确列式是( )
| A. | 84×7-84×3 | B. | 84÷3-84÷7 | C. | 84÷(7-3) |
1.与算式560÷(8×7)计算结果相等的是( )
0 132764 132772 132778 132782 132788 132790 132794 132800 132802 132808 132814 132818 132820 132824 132830 132832 132838 132842 132844 132848 132850 132854 132856 132858 132859 132860 132862 132863 132864 132866 132868 132872 132874 132878 132880 132884 132890 132892 132898 132902 132904 132908 132914 132920 132922 132928 132932 132934 132940 132944 132950 132958 199269
| A. | 560×8÷7 | B. | 560÷8÷7 | C. | 560÷8×7 |