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\(a.3.125.121.8\)
\(=375.121.8\)
\(=45375.8\)
\(=363000\)
\(b.37.64+37.36\)
\(=37.\left(64+36\right)\)
\(=37.100=3700\)
\(c.3.25.8+4.37.6+2.38.12\)
\(=600+888+912=2400\)
câu d là j e ghi rõ cho cj nha
\(a,\frac{15^{33}}{15^{32}.15}=\frac{15^{33}}{15^{33}}=1\)
\(b,6.25.4+3.27.8+96.12\)
\(=6.4.25+3.8.27+24.4.12\)
\(=24.25+24.27+24.48\)
\(=24.\left(25+27+48\right)\)
\(=24.100\)
\(=2400\)
3.25.8 + 4.37.6 + 2.3812 - 24.25 + 24.37 + 24.38
= 24.(25 + 37 + 38) = 2400
Trả lời:
\(A=\frac{3}{4}\cdot\frac{8}{9}\cdot\frac{15}{16}\cdot...\cdot\frac{2499}{2500}\)
\(=\frac{3\cdot8\cdot15\cdot...\cdot2499}{4\cdot9\cdot16\cdot...\cdot2500}\)
\(=\frac{1\cdot3\cdot2\cdot4\cdot3\cdot5\cdot...\cdot49\cdot51}{2\cdot2\cdot3\cdot3\cdot4\cdot4\cdot...\cdot50\cdot50}\)
\(=\frac{\left(1\cdot2\cdot3\cdot...\cdot49\right)\cdot\left(3\cdot4\cdot5\cdot...\cdot51\right)}{\left(2\cdot3\cdot4\cdot...\cdot50\right)\left(2\cdot3\cdot4\cdot...50\right)}\)
\(=\frac{1\cdot51}{50.2}=\frac{51}{100}\)
3*25*8+4*37*6+2*38*12=24*25+24*37+24*38=24*(25+37+38)=24*100=2400
3.25.8+4.6.37+2.38.12
<=> 24.25+24.37+24.38
<=> 24.(25+37+38)
<=> 24.100
<=> 2400
a, 422.431.42=4(22+31+2)=455
b, 3.25.8+4.37.6+76.12=3.4.2.25+4.2.3.37+38.2.3.4
=(3.4.2).(25+37+38)
=24.100=2400
433:431.42=44
3.25.8+4.37.6+76.12=600+888+912=2400