【简算、解方程、四则混合运算各90道,】-查字典问答网
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  【简算、解方程、四则混合运算各90道,】

  简算、解方程、四则混合运算各90道,

5回答
2020-02-29 13:27
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马连宏

  125÷(50÷8)

  =125÷50×8

  =125×8÷50

  =1000÷50

  =20

  7.2×1.02

  =7.2×(1+0.02)

  =7.2×1+7.2×0.02

  =7.2+0.144

  =7.344

  9又9/16÷9

  =(9+9/16)÷9

  =9÷9+9/16÷9

  =1+1/16

  =17/16

  (90+1/88)×1/89

  =(90×88+1)/88×1/89

  =[(89+1)×(89-1)+1]/88×1/89

  =[89^2-1^2+1]/88×1/89

  =89^2/88×1/89

  =89/88

  (1/3-1/4)+(1/4-1/5)+(1/5-1/6)

  =1/3-1/4+1/4-1/5+1/5-1/6

  =1/3-1/6

  =1

  7.6×1/2÷[1.9-1.9×(1.9-1.9)]

  =7.6×1/2÷(1.9-0)

  =3.8÷1.9

  =2

  1又1/6×1又1/7×1又1/8×1又1/9×1又1/10

  =7/6×8/7×9/8×10/9×11/10

  =11/6

  3.26×[1÷(1/10-9/100)]

  =3.26×[1÷(10/100-9/100)]

  =3.26×(1÷1/100)

  =3.26×100

  =326

  (2.5+2.5+2.5+2.5)×25×8

  =(2.5×4)×25×4×2

  =10×100×2

  =2000

  (6.9×0.125×1.75)÷(2.3×1/8×1/4)

  =6.9×0.125×1.75÷2.3÷1/8÷1/4

  =6.9÷2.3×0.125×8×1.75×4

  =3×1×7

  =21

  [5-(0.5×9又1/2+1/2×1/2)]÷8/21

  =[5-(1/2×19/2+1/2×1/2)]×21/8

  =[5-1/2×(19/2+1/2)]×21/8

  =(5-1/2×10)×21/8

  =(5-5)×21/8

  =0

  (12又13/25+7又8/17)×2.5+(9又9/17+10又12/25)2又1/2

  =(12又13/25+7又8/17)×2.5+(9又9/17+10又12/25)×2.5

  =(12又13/25+7又8/17+9又9/17+10又12/25)×2.5

  =(23+17)×2.5

  =40×2.5

  =100

  1又2/3×[7又5/6+(4.125-4又1/8)-4又5/6]

  =5/3×[7又5/6-4又5/6+(4又1/8-4又1/8)]

  =5/3×(3+0)

  =5

  8又17/23+5又1/4-6又17/23+0.75

  =(8又17/23-6又17/23)+(5.25+0.75)

  =2+6

  =8

  (5又5/9-0.8+2又4/9)×12.5

  =(5又5/9+2又4/9-0.8)×12.5

  =(8-0.8)×12.5

  =8×12.5-0.8×12.5

  =100-10

  =90

  2.25×3/7×0.4×2又1/3

  =2.25×0.4×3/7×7/3

  =0.9×1

  =0.9

  0.91÷4/5+1.25×1.09

  =0.91×5/4+5/4×1.09

  =5/4×(0.91+1.09)

  =5/4×2

  =2.5

  9又2000/2001×1949

  =(10-1/2001)×1949

  =10×1949-1/2001×1949

  =19490-1949/2001

  =10489+(1-1949/2001)

  =10489+52/2001

  =10489又52/2001

  24×51/43+51×19/43

  =24×51/43+19×51/43

  =(24+19)×51/43

  =43×51/43

  =51

  13.76-(7/12+1.76+1又5/12)

  =13.76-[1.76+(7/12+1又5/12)]

  =13.76-1.76-2

  =12-2

  =10

  19.98×37-199.8×1.9+1998×0.82

  =199.8×3.7-199.8×1.9+199.8×8.2

  =199.8×(3.7-1.9+8.2)

  =199.8×10

  =1998

  0.32×6.7+3.2×0.43-0.32

  =3.2×0.67+3.2×0.43-3.2×0.1

  =3.2×(0.67+0.43-0.1)

  =3.2×1

  =3.2

  2.5×12.5×32-32-563

  =2.5×12.5×4×8-(32+563)

  =(2.5×4)×(12.5×8)-595

  =10×100-595

  =1000-595

  =405

  9又3/4-15/19-2/19×2

  =9又3/4-(15/19+4/19)

  =9又3/4-1

  =8又3/4

  (2/3+1/5)+(2/3-12/17)-(1/5+5/17)

  =2/3+1/5+2

2020-02-29 13:29:03
林忠钦

  题数好像不够、、、、、、、、、、、、

2020-02-29 13:29:37
马连宏

  你要是有教材全解,可以从那上面找。

2020-02-29 13:30:27
林忠钦

  o

2020-02-29 13:33:09
马连宏

  对于学习要用心去学,不要对它视而不见,要把学习当成大事!

2020-02-29 13:37:20

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