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(2+4+6+8+...+100) x (15x3-15x2-15)
=(2+4+6+8+....+100)x(15x(3-2-1))
=(2+4+6+8+...+100)x(15x0)
=(2+4+6+8+...+100)x0
=0
3 + 7 + 11 + 15 + 19
= (3 + 7) + ( 11 +19) + 15
= 10 + 30 + 15
= 40+15
=55
a) \(\frac{18}{15}+\frac{7}{15}+\frac{12}{15}\)
\(=\left(\frac{18}{15}+\frac{12}{5}\right)+\frac{7}{15}\)
\(=6+\frac{7}{15}\)
\(=\frac{97}{15}\)
b) \(\frac{9}{7}+\frac{8}{7}+\frac{11}{7}\)
\(=\frac{17}{7}+\frac{11}{7}\)
\(=\frac{28}{7}=4\)
TL
a) \(\frac{18}{15}+\frac{7}{15}+\frac{12}{15}\)\(=\frac{97}{15}\)
b) \(\frac{9}{7}+\frac{8}{7}+\frac{11}{7}\)\(=4\)
nha bn
HT
5/11.5/7+2/7.5/11
=5/11.(5/7+2/7)
=5/11
15 x 7/15 x 4/9
=7 x 4/9
=28/9
=100+200:(30*2)*80
=100+200:2:30*80
=100+100:5:15*80
=100+20:15*80
100+20:1200
=100+1/60
=6001/60
a)C1:=2/7:2/5
=5/7
C2:=6/7:2/5-4/7:2/5
=15/7-10/7
=5/7
b)C1:=88/30+77/30
=11/2
C2:=(8/15+7/15):2/11
=1:2/11
=11/2
15+15*2+7*15-100
=15*(1+2+7)-100
=15*10-100
=150-100
=50
15+15*2+7*15-100=15*1+15*2+7*15-100
=15*(1+2+7)-100
=15*10-100
=150-100
=50