Toán Lớp 6: Bài 3: Thực hiện phép tính (tính nhanh nếu có thể)
a)57+725+605-53. b) (-624)-[(376+235)-35]
c)58.75+58.50-58.25. d)12.35+35.182-35.94
e)(55+45+15)-(15-55+45). f)48.19+48.115+134.52
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Toán Lớp 6: Bài 3: Thực hiện phép tính (tính nhanh nếu có thể)
a)57+725+605-53. b) (-624)-[(376+235)-35]
c)58.75+58.50-58.25. d)12.35+35.182-35.94
e)(55+45+15)-(15-55+45). f)48.19+48.115+134.52
Comments ( 2 )
$ a)57+725+605-53=57-53+725+605=4+1330=1334 $
$ b)(-624)-[(376+235)-35]=(-624)-[376+235-35]=(-624)-(376+200)=(-624)-576=-1200 $
$ c)58.75+58.50-58.25=58.(75+50-25)=58.100=5800 $
$ d)12.35+35.182-35.94=35.(12+182-94)=35.100=3500 $
$ e)(55+45+15)-(15-55+45)=55+45+15-15+55-45=55+55+45-45+15-15=110+0+0=110 $
$ f)48.19+48.115+134.52=48.(19+115)+134.52=48.134+134.52=134.(48+52)=134.100=13400 $
a)57+725+605-53
=57-53+725+605
=4+1330
=1334
b)(-624)-[(376+235)-35]
=(-624)-[376+235-35]
=(-624)-[376+200]
=(-624)-576
=-1200
c)58.75+58.50-58.25
=58.(75+50-25)
=58.100
=5800
d)12.35+35.182-35.94
=35.(12+182-94)
=35.100
=3500
e)(55+45+15)-(15-55+45)
=55+45+15-15+55-45
=55+55+45-45+15-15
=110+0+0
=110
f)48.19+48.115+134.52
=48.(19+115)+134.52
=48.134+134.52
=134.(48+52)
=134.100
=13400
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