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一年级数学题怎么做

发表时间:2024-07-18 04:39:40 来源:网友投稿

例1、5.76+13.67+4.24+6.33

=(5.76+4.24)+(13.67+6.33)

=10+10

=20

例2、37.24+23.79-17.24

=37.24-17.24+23.79

=20+23.79

=43.79

例3、4×3.78×0.25

=4×0.25×3.78

=1×3.78

=3.78

例4、125×246×0.8

=125×0.8×246

=100×246

=24600

例5、(2.5+12.5)×40

=2.5×40+12.5×40

=100+500

=600

例6、3.68×4.79+6.32×4.79

=(3.68+6.32)×4.79

=10×4.79

=47.9

例7.26.86×25.66-16.86×25.66

=(26.86-16.86)×25.66

=10×25.66

=256.6

例8、5.7×99+5.7

=5.7×(99+1)

=5.7×100

=570

例9、34×9.9

=34×(10-0.1)

=34×10-34×0.1

=340-3.4

=336.6

例10、57×101

=57×(100+1)

=57×100+57×1

=5757

例11、7.8×1.1

=7.8×(1+0.1)

=7.8×1+7.8×0.1

=7.8+0.78

=8.58

例12、25×32

=25×4×8

=100×8

=800

例13、125×0.72

=125×8×0.09

=1000×0.09

=90

例14、87×2/85

=(85+2)×2/85

=85×2/85+2×2/85

=2+4/85

=2又4/85

例15、56.5-3.7-6.3

=56.5-(3.7+6.3)

=56.5-10

=46.5

例16、32.6÷0.4÷2.5

=32.6÷(0.4×2.5)

=32.6÷1

=32.6

例16、86.7×0.356+1.33×3.56

=8.67×3.56+1.33×3.56

=(8.67+1.33)×3.56

=10×3.56

=35.6

例17、15.6÷4-5.6×1/4

=15.6×1/4-5.6×1/4

=(15.6-5.6)×1/4

=10×1/4

=2又1/2

例18、16/23×27+16×19/23

=27/23×16+16×19/23

=16×(27/23+19/23)

=16×2例1、5.76+13.67+4.24+6.33

=(5.76+4.24)+(13.67+6.33)

=10+10

=20

例2、37.24+23.79-17.24

=37.24-17.24+23.79

=20+23.79

=43.79

例3、4×3.78×0.25

=4×0.25×3.78

=1×3.78

=3.78

例4、125×246×0.8

=125×0.8×246

=100×246

=24600

例5、(2.5+12.5)×40

=2.5×40+12.5×40

=100+500

=600

例6、3.68×4.79+6.32×4.79

=(3.68+6.32)×4.79

=10×4.79

=47.9

例7.26.86×25.66-16.86×25.66

=(26.86-16.86)×25.66

=10×25.66

=256.6

例8、5.7×99+5.7

=5.7×(99+1)

=5.7×100

=570

例9、34×9.9

=34×(10-0.1)

=34×10-34×0.1

=340-3.4

=336.6

例10、57×101

=57×(100+1)

=57×100+57×1

=5757

例11、7.8×1.1

=7.8×(1+0.1)

=7.8×1+7.8×0.1

=7.8+0.78

=8.58

例12、25×32

=25×4×8

=100×8

=800

例13、125×0.72

=125×8×0.09

=1000×0.09

=90

例14、87×2/85

=(85+2)×2/85

=85×2/85+2×2/85

=2+4/85

=2又4/85

例15、56.5-3.7-6.3

=56.5-(3.7+6.3)

=56.5-10

=46.5

例16、32.6÷0.4÷2.5

=32.6÷(0.4×2.5)

=32.6÷1

=32.6

例16、86.7×0.356+1.33×3.56

=8.67×3.56+1.33×3.56

=(8.67+1.33)×3.56

=10×3.56

=35.6

例17、15.6÷4-5.6×1/4

=15.6×1/4-5.6×1/4

=(15.6-5.6)×1/4

=10×1/4

=2又1/2

例18、16/23×27+16×19/23

=27/23×16+16×19/23

=16×(27/23+19/23)

=16×2

=32

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