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7,89 x 54 - 7,89 x 52 -7,89
7,89x{54-52-1}
7,89x1=7,89
k nha!
=5,6x(4+3+1)
=5,6x8
=44,83
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7,89x(54-52-89)
=7,89x-87
=-686,43
5,6 x 4 + 5,6 x 3 + 5,6 x 2 + 5,6 = 5,6 x 4 + 5,6 x 3 + 5,6 x 2 + 5,6 x 1 = 5,6 x (4 + 3 + 2 +1) = 5,6 x 10 = 56
7,89 x 54 - 7,89 x 52 - 7,89 = 7,89 x 54 - 7,89 x 52 - 7,89 x 1 = 7,89 x (54 - 52 - 1) = 7,89 x 1 = 7,89.
0,9+0,3*4+0,3*93
=0,3*3+0,3*4+0,3*93
=0,3*(3+4+93)
=0,3*100
=30
0,9+0,3x4+0,3x93
= 0,3x(4+93)+0,9
= 0,3x97+0,9
= 29,1+0,9
=30
2012 x 95 + 2012 x 4 + 2012
= 2012 x 95 + 2012 x 4 + 2012 x 1
= 2012 x ( 95 + 4 + 1 )
= 2012 x 100
= 201200
2012 x 95 + 2012 x 4 + 2012
= 2012 x 95 + 2012 x 4 + 2012 x 1
= 2012 x ( 95 + 4 + 1 )
= 2012 x 100
= 201200
\(\frac{5}{9}:\frac{4}{7}+\frac{13}{9}\cdot\frac{7}{4}\)
\(=\frac{5}{9}\cdot\frac{7}{4}+\frac{13}{9}\cdot\frac{7}{4}\)
\(=\left(\frac{5}{9}+\frac{13}{9}\right)\cdot\frac{7}{4}\)
\(=2\cdot\frac{7}{4}\)
\(=\frac{14}{4}\)
=\(\frac{5}{9}\)*\(\frac{7}{4}\)+\(\frac{13}{9}\)*\(\frac{7}{4}\)
=\(\frac{7}{4}\)*(\(\frac{5}{9}+\frac{13}{9}\))
=\(\frac{7}{4}\)*2
=\(\frac{7}{2}\)
\(\frac{4}{15}+\frac{8}{13}+\frac{11}{15}+\frac{5}{13}\)
\(=\left(\frac{4}{15}+\frac{11}{15}\right)+\left(\frac{8}{13}+\frac{5}{13}\right)\)
\(=\frac{15}{15}+\frac{13}{13}\)
\(=1+1\)
\(=2\)
Chúc bạn học tốt nha !!!
\(\frac{4}{15}+\frac{8}{13}+\frac{11}{15}+\frac{5}{13}\)
\(=\left(\frac{4}{15}+\frac{11}{15}\right)+\left(\frac{8}{13}+\frac{5}{13}\right)\)
\(=1+1\)
\(=2\)
f,
\(7,89\times54-7,89\times52-7,89\)
⇔\(7,89\times54-7,89\times52-7,89\times1\)
⇔\(7,89\left(54-52-1\right)\)
\(=7,89\times1\)
\(=7,89\)
g,
\(69,78\times75\%+69,78\times\dfrac{1}{4}+69,78\times99\)
⇔\(69,78\times0,75+69,78\times0,25+69,78\times99\)
⇔\(69,78\left(0,75+0,25+99\right)\)
\(=69,78\times100\)
\(=6978\)