小升初巧算专项训练
Company number:【WTUT-WT88Y-W8BBGB-BWYTT-19998】
小升初巧算专项训练
学员姓名: 专项1:小数分数运算律的运用
389717 ②13—?(3.27—1)(4?3)—0.75 ③975?0.25?9?76—9.75
4171713413①6.73—2④999999×222222+333333×333334 ⑤45×+× ⑥139?⑦72×—× ⑧×+×+× 专项2:大数认识及运用
① 23456+34562+45623+56234+62345 ②66666
1371 ?137?1381381988?1989?1987 ③ 99999×77776+33333×
1988?1989—18937673511749④ 20122—20112 ⑤ 999×274+6274 ⑥ (?1?)?(??)⑦××
专项3:分数专题 ①73?⑥
13742008111314 ②?2010 ③?57 ④41??51? ⑤?39??27
447520097634451451238731711 ⑧?????3 ??? ⑦238?2381791792391581516152专项4:裂项求和 ①
111111111111111 ②????? ③??? ???????10?1111?1212?1349?502612203042428701302081491113152010201020102010201022222 ⑤ ⑥???? ?—?????203042561?22?33?44?55?6392781243④1—专项5:计算综合 ①??131111111114?5?6?8?10?12?16?20?24 ②6666……666×6666……6667 ③ ???????610152128364550552?3?4?4?6?8?8?12?162016个6 2015个6 ⑤(1+3+5+7+…+1999)-(2+4+6+8+…+1998) ?1??1??1??1?1??④4444……4442222……222÷6666……666 ⑥??1—???1—???1—???1—??????1??
2??3??4??5??10???????⑦????????????????????20162个4 11?33??4201623个2 144??52520164个6 355?123499????????? 100100100100100??专项6:超大数的巧算
①
123454321888888?999999252252?525525525 ?108 ②?36 ③
66666?9999912345654321252252252?525525专项7:利用积不变、拆数和乘法分配律巧算 ①×67+×+× ②×+61×+× 专项8:牢记设字母代入法
①(1++)×(++)-(1+++)×(+) ②(1++)×(++)-(1+++)×(+)
111??1111??1111??111?③??1??????????—?1?????????? ?234??2345??2345??234?④??⑤??1111??1111??11111??111???????????—??????????? ?11213141??21314151??1121314151??213141?531579753??579753135??531579753135??579753?????????????—????? 135357975357975531135357975531357975????????专项9:利用a?b?巧算
11??33?①×480×÷×120× ②??4?5?????
?54??45?ab专项10:利用裂项法巧算 ①
11111111111111 ② ③????? ????????????1?22?33?499?1001?33?55?79?112612203042④1×2+2×3+3×4+…+99×100 ⑤1×2×3+2×3×4+3×4×5+…+9×10×11 专项11:递推法或补数法 ①???③
121418111111111111 ②???????? ?????316212424849624816325121024123456 ?????1?21?2?31?2?3?41?2?3?4?51?2?3?4?5?61?2?3?4?5?6?7专项12: 斜着约分更简单
1??1??1?1??1?1??1??1?1??1????①??1????1????1???????1????1?? ②?1—???1—???1—??????1—???1—? ?2??3??4??99??100??2??3??4??99??100?专项13:定义新运算
1、规定a⊙b=b÷(a+b),则2⊙(5⊙3)= 。
2、如果1※4=1234,2※3=234 ,7※2=78,那么4※5= 。