Tính nhanh: 47x12+28x47+16x5
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27 kém 47 là 20 đơn vị.
48 hơn 28 là 20 đơn vị.
Vậy:27x48=28x47
a)=16x4+16x5+16x1
=16x(4+5+1)
=16x10
=160
b)=9x(25+25+50)
=9x100
=900
a) 16x4+16x5+16
= 16 x ( 4 + 5 ) + 16
= 16 x 9 + 16
= 144 + 16
= 160
b) 9x25+9x25+9x50
= 9 x ( 25 + 25 + 50 )
= 9 x 100
= 900
a) 48 x 36 + 24 x 28
= 24 x 2 x 36 + 24 x 28
= 24 x (2 x 36 + 28)
= 24 x 100
= 2400
b) 47 x 12 + 53 x 13
= 1253
c) \(A=\frac{101+100+99+...+3+2+1}{101-100+99-98+...+3-2+1}=\frac{\left(101+1\right).101:2}{51.1+1}.\)
\(=\frac{102.101:2}{52}=\frac{5151}{52}\)
\(\frac{9\cdot8\cdot33}{56\cdot54\cdot11}=\frac{9\cdot8\cdot3\cdot11}{8\cdot7\cdot9\cdot3\cdot2\cdot11}=\frac{1}{7\cdot2}=\frac{1}{14}\)
\(\frac{8\cdot15+16\cdot4-8\cdot21}{16\cdot5-8\cdot9}=\frac{8\cdot15+8\cdot2\cdot4-8\cdot21}{2\cdot8\cdot5-8\cdot9}=\frac{8\cdot15+8\cdot8-8\cdot21}{8\cdot10-8\cdot9}=\frac{8\left(15+8-21\right)}{8\left(10-9\right)}=\frac{8\cdot2}{8\cdot1}=\frac{2}{1}=2\)
\(\frac{8x15+16x4-8x21}{16x5-8x7}\)
\(\Rightarrow=\frac{120+64-168}{80-56}=\frac{16}{24}=\frac{2}{3}\)
Ủng hộ đi nhen
\(\frac{8\times25+16\times4-8\times21}{16\times5-8\times7}\)
\(\Rightarrow\frac{120+64-168}{80-56}\)
\(\Rightarrow\frac{16}{24}=\frac{2}{3}\)
450 - 60 - 10x = 16 x 5
450 - 60 - 10x = 80
60 - 10x = 450 - 80
60 - 10x = 370
10x = 60 - 370
10x = -310
x = -310 : 10
x= -31
Vậy x = -31
a: \(16x^5-25x^3\)
\(=x^3\left(16x^2-25\right)\)
\(=x^3\left(4x-5\right)\left(4x+5\right)\)
b: \(x^2-2xy+y^2-16\)
\(=\left(x-y\right)^2-16\)
\(=\left(x-y-4\right)\left(x-y+4\right)\)
c: \(x^2-5y-xy+5x\)
\(=x\left(x-y\right)+5\left(x-y\right)\)
\(=\left(x-y\right)\left(x+5\right)\)
d: \(x^2\left(x^2+4\right)-x^2+4\)
\(=\left(x^2+4\right)\left(x^2-1\right)\)
\(=\left(x^2+4\right)\left(x-1\right)\left(x+1\right)\)
47 x 12 + 28 x 47 + 16 x 5
= 47 x ( 12 + 28 ) + 16 x 5
= 47 x 40 + 40 x 2
= 40 x ( 47 + 2 )
= 40 x 49
= 1960