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\(12.57+57.15+63.57\\ \Rightarrow57.\left(12+15+63\right).\\ \Rightarrow57.90=5130.\)
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a) 34.15 + 34.85 = 34.(15+85) = 34.100 = 3400
b) 12.57 + 57.25 + 63.57 = 57.(12+25+63) = 57.100 = 5700
c) 36.28 + 36.82 + 64.69 + 64.41 = 36.(28+82) + 64(69+41) = 36.110 + 64.110 = 110.(36+64) = 11000
d) 2.31.12 + 4.6.42 + 8.27.3 = 24.31 + 24.42 + 24.27 = 24.(31+42+27) = 24.100 = 2400
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57.43 + 12.57 + 55.43
= [57.43 + 12.57] + 55.43
= 70.00 + 55.43
= 125.43
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25 x 5 x 4 x 27 x 2
= ( 25 x 4 ) x ( 5 x 2 ) x 27
= 100 x 10 x 27
= 1000 x 27
= 27000
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(111*222+444*888)/(222*444+333*666)=(111*111*2+444*444*2)/(222*222*2+333*333*2)=[(1112+4442)*2]/[(2222+3332)*2]=(1112+1112*42)/(1112*22+1112*32)=[(1112)(1+16)]/[(111)2(4+9)]=17/13
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12,57 + 57,15 + 63,15
= 12,57 + (57,15 + 63,15)
= 12,57 + 120,3
= 132,87
\(12.57+57.15+63.15\)
\(=12.57+15.\left(57+63\right)\)
\(=12.57+15.120\)
\(=12.57+15.10.12\)
\(=12.57+150.12\)
\(=12.\left(57+150\right)\)
\(=12.207\)
\(=2484\)