\(1,\)
\(a,1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+\frac{1}{81}\)
\(=\frac{81}{81}+\frac{27}{81}+\frac{9}{81}+\frac{3}{81}+\frac{1}{81}\)
\(=\frac{81+27+9+3+1}{81}\)
\(=\frac{121}{81}\)
\(=1\frac{40}{81}\)
\(b,37,25+4,7.2,3-9,8\)
\(=37,25+10,81-9,8\)
\(=38,26\)
\(2,\)
\(a,x:4,37=5,6\left(dư1,53\right)\)
\(x=5,6.4,37+1,53\)
\(\Rightarrow x=26,002\)
\(b,13,5.\left(x:5,6\right)=36,45\)
\(\left(x:5,6\right)=36,45:13,5\)
\(x:5,6=2,7\)
\(x=2,7.5,6\)
\(\Rightarrow x=15,12\)
1.
a . =81/81 + 27/81 + 3/81 + 1/81
= 112/81
b = 37,52 + 10,81 - 9,8
= 48,33 - 9,8
= 38,53
2.
a .x = 5,6 nhân 4,37 +1,53
x=24, 472 + 1,53
x= 26,002
b. x:5,6=36,45:13,5
x :5,6= 2,7
x=2,7 nhân 5,6
x=15,12
1.
1+1/3+1/9+1/27+1/81
=81/81+27/81+3/81+1/81
=112/81
b)37,52+4,7*2,3-9,8
=37,52+10,81-9,8
=48,33-9,8
=38,53
2.
a) x:4,37=5,6(dư 1,53)
x=5,6*4,37+1,53
x=26.002
b) 13,5*(x:5,6)=36,45
x:5,6=36,45/13,5
x:5,6=2,7
x=2,7*5,6
x=15,12
K CHO MÌNH NHA
1.
a . =81/81 + 27/81 + 3/81 + 1/81
= 112/81
b = 37,52 + 10,81 - 9,8
= 48,33 - 9,8
= 38,53
2.
a .x = 5,6 nhân 4,37 +1,53
x=24, 472 + 1,53
x= 26,002
b. x:5,6=36,45:13,5
x :5,6= 2,7
x=2,7 nhân 5,6
x=15,12
