1.2+2.9+3.7+7.7=?
a) 6.3+(-3.7)+2.4+(-0.3)
b)(-4.9)+5.5+4.9+(-5.5)
c)2.9 +3.7+(-4.2)+(-2.9)+4.2
d)(-6.5).2.8+2.8.(-3.5)
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height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300">
a) 6.3+(-3.7)+2.4+(-0.3)
b)(-4.9)+5.5+4.9+(-5.5)
c)2.9 +3.7+(-4.2)+(-2.9)+4.2
d)(-6.5).2.8+2.8.(-3.5)
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.
Cho A=7.7^2.7^3.7^4. ... .7^29
Tìm số dư của A khi chia cho 8
cíu mình zới
nhầm, nhân thành cộng nhé mn
sau khi them vao so tru 3.7 va bot o so bi tru 2.9 thi hieu hai so la 15.4. Tim hieu ban dau
hiệu ban đầu là: 15.4-(2.9+3.7)=8.8
đúng đấy nhé tớ đã được cô giáo chữa cho rồi đó
nếu thêm vào số bé 3.7 và bớt số lớn 2.9 thì hiệu mới là 15.4 .tìm hiệu cũ của hai số đó.(có vẽ hình)
Hiệu cũ của 2 số đó là :
15,4 + 3,7 + 2,9 = 22
Đáp số :22
hiệu cũ là:
15,4+ 3,7+2,9=22
đáp số :22
Hiệu cũ của số đó là:
15,4 + 3,7 + 2,9 = 22
Đáp số : 22
Tìm x biết: x + 1/1.2 + 1/2.4 + 1/3.7+1/7.11+1/11.16=1
x = \(\frac{163}{528}\)
cho 1 đ-ú-n-g nha bạn
1.Tính tổng: A = 1.2 + 3.4 +...+ 2(2n+1)(n+1)
2.Tính tổng: A = 1.3 + 3.7 + 5.11 +...+ 99.199
Do:Có những cặp phân số mà khi ta nhận chúng với nhau hoặc công chúng với nhau đều được cùng một kết quả.Chẳng hạn:Cặp phân số 7/3 va 7/4 co:7/3.7/4=7.7/3.4=49/12 7/3+7/4=7.4+7.3/12=49/12
Tìm x,biết x là số tự nhiên và (1.2+3.7)<x<(2.1+3.2)