I'll fill it out. (*** 12)
1.(3, 4)
2.(90)。 ( 50 ),(4500)。
3.( 2280)( 6 )( 22800 )(600)
4.( 100)(980 1)
5.( 300)( 1500)( 1800)( 18000)
5. A just judge (tick the right one in brackets and cross the wrong one). (10)
1.(× )
2.(√ )
3.( √ )
4.( × )
5.(× )
Third, little psychic.
1. Oral calculation (20 points)
60 90 60 150 0 1000 980 99 120 0
2. Using vertical calculation:
864 1296 17 10 480 1620 999 15 12 1377 2666
3。 exclusive of
3 14 3000 82 840 945 1904