51.72+105.12:3.6 4.8x0.75-6.3:3.5
Những câu hỏi liên quan
6.3 x 6.4 + 3.6 x 6.3 = .............
A. 63
B.39
C.36
D.46
Xem thêm câu trả lời
Tính nhanh các tổng sau:
a) D=1.4+2.5+3.6+..+100.103
b) E=1.3+2.4+3.5+...+97.99+98.100
Tìm 1 số thập phân , biết rằng lấy số đó nhân với 3.5 rồi chia cho 4 thì dc 6.3 .
Gọi số cần tìm là a lập biểu thức :
a . 3,5 : 4 = 6,3
=> a.3,5 = 6,3 . 4
=> a.3,5 = 25,2
=> a = 25,2 : 3,5
=> a = 7,2
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a.3,5:4=6,3
=> a.3,5= 6,3.4
=> a.3,5= 25,2
=> a= 25,2: 3,5
=> a=7,2
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tính:
A=1.3+2.4+3.5+...+99.101
B=1.4+2.5+3.6+...+99.102
a) 3^6.3^7=
b) x^10:x^6:x
c) a^5.a^9
d) 2^3.8^5.16^4
e) 25^3.5^5.3125
f) a^10.a^4:a^12
a) \(3^6.3^7\) \(=3^{13}\)
b) \(x^{10}:x^6:x\)
\(=x^{10}:x^7\)\(=x^3\)
c) \(a^5.a^9=a^{14}\)
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\(a,=3^{6+7}=3^{13}\\ b,=x^{10-6-1}=x^3\\ c,=a^{5+9}=a^{14}\\ d,=2^3\cdot2^{15}\cdot2^{16}=2^{34}\\ e,=5^6\cdot5^5\cdot5^5=5^{16}\\ f,=a^{10+4-12}=a^2\)
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d) \(2^3.8^5.16^4\)
\(=2^3.\left(2^3\right)^5.\left(2^4\right)^4\)
\(=2^3.2^{15}.2^{16}\)
\(=2^{34}\)
e) \(25^3.5^5.3125\)
\(=\left(5^2\right)^3.5^5.5^5\)
\(=5^6.5^5.5^5\)
\(=5^{16}\)
f) \(a^{10}.a^4:a^{12}\)
\(=a^{14}:a^{12}\)
\(=a^2\)
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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">
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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.
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Tính tổng:
a) 1.2 + 2.3 + 3.4 + ... + 99.100
b) 1.3 + 2.4 + 3.5 + ... + 99.101
c) 1.4 + 2.5 + 3.6 + ... + 99.102
tính nhanh:
câu 1: 0.36 x 630 + 0.6 x 36 x 6 + 3.6
câu 2: 3.5 x 20.2 +6.5 x 27.9 + 3.5 x 2.2 - 6.5 x 5.5
giúp mik làm câu này mik đang cần gấp
Câu 1 : \(0,36\times630+0,6\times36\times6+3,6\)
\(=0,36\times10\times63+0,6\times6\times36+3,6\)
\(=3,6\times63+3,6\times36+3,6\)
\(=3,6\times\left(63+36+1\right)\)
\(=3,6\times100\)
\(=360\)
Câu 2 :\(3,5\times20,2+6,5\times27,9+3,5\times2,2-6,5\times5,5\)
\(=3,5\times\left(20,2+2,2\right)+6,5\times\left(27,9-5,5\right)\)
\(=3,5\times22,4+6,5\times22,4\)
\(=22,4\times\left(3,5+6,5\right)\)
\(=22,4\times10\)
\(=224\)
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