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4 tháng 8 2016

1.2+2.9+3.7+7.7=2.(1+9)+7.(3+7)

                          =2.10+7.10

                          =(2+7).10

                          =9.10

                          =90

1.2+2.9+3.7+7.7

=2+18+21+49

=20+21+49

=41+49

=90

5 tháng 9 2016

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23 tháng 8 2016

a) 6,3 + (-3,7) + 2,4 + (-0,3)

= (6,3 + 2,4) + [-3,7 + (-0,3)]

= 8,7 + (-4)

=  4,7

b) (-4,9) + 5,5 + 4,9 + (-5,5)

= (-4,9 + 4,9) + [5,5 + (-5,5)]

= 0 + 0

= 0

c) 2,9 + 3,7 + (-4,2) + (-2,9) + 4,2

= [2,9 + (-2,9)] + (-4,2 + 4,2) + 3,7

= 0 + 0 + 3,7

= 3,7

d) (-6,5) . 2,8 + 2,8 . (-3,5)

= 2,8 . [-6,5 + (-3,5)]

= 2,8 . (-10)

= -28.

13 tháng 12 2021

nhầm, nhân thành cộng nhé mn

15 tháng 11 2016

hiệu ban đầu là:       15.4-(2.9+3.7)=8.8                                                                                                                                                                                                                                         

17 tháng 11 2016

đúng đấy nhé tớ đã được cô giáo chữa cho rồi đó

8 tháng 4 2017

Hiệu cũ của 2 số đó là :

   15,4 + 3,7 + 2,9 = 22

                 Đáp số :22

8 tháng 4 2017

hiệu cũ là:

15,4+ 3,7+2,9=22

đáp số :22

30 tháng 4 2015

x = \(\frac{163}{528}\)

cho 1 đ-ú-n-g nha bạn

27 tháng 4 2021

4,9<5<5,3