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6,9+8,75+3,1
=(6,9+3,1)+8,75
=10+8,75=18,75
4,67+5,88+3,122
=4,67+(5,88+3,122)
=4,67+9,002
=13,672
0,75+1,19+2,25+0,81
=(0,75+2,25)+(1,19+0,81)
=3+2
=5
6,9+8,75+3,1
=(6,9+3,1)+8,75
= 10 + 8,75
=18,75
4,67+5,88+3,12
=4,67+(5,88+3,12)
=4,67+ 9
= 13,67
0,15+1,19+2,25+0,81
= (0,15+2,25)+(1,19+0,81)
= 2,4+ 2
= 4,4
2,96+4,58+3,04
=(2,96+3,04)+4,58
= 6+4,58
= 10,58
7,8+5,6+4,2+0,4
=(7,8+4,2)+(5,6+0,4)
= 12+ 6
=18
8,69+2,23+4,77
=8,69+(2,23+4,77)
= 8,69+ 7
=15,69
k mình nha
6,9+8,75+3,1= ( 6,9 + 3,1) + 8,75 = 10 + 8,75= 18, 75
4,67+5,88+3,12= 4,67 + (5,88 + 3,12) = 4,67 + 9 = 13,67
0,15+1,19+2,25+0,81= (0,15 + 2,25 ) + (1,19 + 0,81) = 2,4 + 2 = 4,4
2,96+4,58+3,04= ( 2,96 + 3,04 ) + 4,58 = 6 + 4,58 = 10,58
7,8+5,6+4,2+0,4= (7,8 + 4,2 ) + ( 5,6 + 0,4) = 12+6 = 18
8,69+2,23+4,77= 8,69 + (2,23 + 4,77) = 8,69 + 7 = 15,69
a) \(12,1.5,5+12,1.4,5=12,1.\left(5,5+4,5\right)=12,1.10=121\)
b) \(67,8+67,8.3,5+5,5.67,8=67,8.\left(1+3,5+5,5\right)=67,8.10=678\)
c) \(0,75+1,19+2,55+0,81=\left(0,75+2,55\right)+\left(1,19+0,81\right)=3,3+2=5,3\)
d) \(17,6-5,3+16,8-7,6+15,3-6,8=\left(17,6-7,6\right)+\left(-5,3+15,3\right)+\left(16,8-6,8\right)=10+10+10=10.3=30\)
\(a,\)\(12,1\times5,5+12,1\times4,5=12,1\times\left(5,5+4,5\right)=12,1+10=121\)
\(b,\)\(67,8+67,8\times3,5+5,5\times67,8\)
\(=67,8\times\left(5,5+3,5+1\right)=67,8\times10=678\)
\(c,\)\(0,75+1,19+2,55+0,81\)
\(=\left(0,75+2,55\right)+\left(1,19+0,81\right)\)
\(=3,3+2=5,3\)
\(d,\)\(17,6-5,3+16,8-7,6+15,3-6,8\)
\(=\left(17,6-7,6\right)+\left(16,8-6,8\right)+\left(15,3-5,3\right)\)
\(=10+10+10=30\)
7,34 + 0,45 + 2,66 + 0,55
= (7,34 + 2,66) + (0,45 + 0,55)
= 10 + 1
= 11
5,75 + 7,8+ 4,25 + 1,2
= (5,75 + 4,25) + (7,8 + 1,2)
= 10 + 9
= 19
0,75 + 1,19 + 2,25 + 0,81 = ( 0,75 + 2,25) + (1,19 + 0,81)
= 3 + 2 = 5