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小升初數(shù)學題:小題的速算與巧算

時間:2021-07-13 10:19:38 數(shù)學 我要投稿

小升初數(shù)學題:小題的速算與巧算

  1、計算4.75-9.64+8.25-1.36.

小升初數(shù)學題:小題的速算與巧算

  原式=(4.75+8.25)-(9.64+1.36)

  =13-11

  =2.

  2、計算3.17-2.74+4.7+5.29-0.26+6.3.

  原式=(3.71+5.29)+(4.7+6.3)-(2.74+0.26)

  =9+11-3

  =17.

  3、計算(5.25+0.125+5.75)×8.

  原式=(5.25+5.75+0.125)×8

  =(11+0.125)×8

  =11×8+0.125×8

  =88+1

  =89

  4、計算34.5×8.23-34.5+2.77×34.5.

  原式=34.5×(8.23-1+2.77)

  =34.5×(7.23+2.77)

  =34.5×10

  =345

  5、計算6.25×0.16+264×0.0625+5.2×6.25+0.625×20.

  原式=6.25×0.16+2.64×6.25+5.2×6.25+6.25×2

  =6.25×(0.16+2.64+5.2+2)

  =6.25×10

  =62.5

  6、計算l0.035×935+0.035+3×0.035+0.07×61×0.5.

  原式=l0.035×935+0.035+3×0.035+0.07×0.5×61

  =l0.035×935+0.035+3×0.035+0.035×61

  =0.035×(935+1+3+61)

  =0.035×1000

  =35

  7、計算19.98×37-199.8×1.9+1998×0.82.

  原式=199.8×3.7-199.8×1.9+199.8×8.2

  =199.8×(3.7-1.9+8.2)

  =199.8×10

  =1998

  8、計算0.888×125×73+999×3.

  原式=0.111×(8×125)×73+111×(9×3)

  =111×73+111×27

  =111×(73+27)

  =111×100

  =11100

  9、計算1998+199.8+19.98+1.998.

  原式=(2000-2)+(200-0.2)+(20-0.02)+(2-0.002)

  =2222-2.222

  =2222-(10-7.778)

  =2222-10+7.778

  =2219.778

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