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\(a.1,25\times5\times6,3\div0,125\times2\\ =\left(5\times2\right)\times\left(1,25\div0,125\right)\times6,3\\ =10\times10\times6,3=630\)
\(b.12,5\times6,9+0,1\times6,9\times865\times6,9\\ =6,9\times\left(12,5+86,5+1\right)\\ =6,9\times100=690\)
ta có :
\(12.5:0.5+12.5:0.25+12.5:0.125-12.5\times4=12.5\times2+12.5\times4+12.5\times8-12.5\times4\)
\(=12.5\times\left(2+4+8-4\right)=12.5\times10=125\)
\(12,5:0,5+12,5:0,25+12,5:0,125-12,5\times4\)
\(=12,5\times2+12,5\times4+12,5\times8-12,5\times4\)
\(=12,5\times\left(2+4+8-4\right)\)
\(=12,5\times10\)
\(=125\)
_HT_
= 12,5 x 2 + 12,5 x 4 + 12,5 x 8 - 12,5 x 4
= 12,5 x (2+4+8-4)
= 12,5 x 10
= 125
Ta có:
\(12,5:0,5+12,5:0,25+12,5:0,125-12,5×4\)
\(=12,5:\left(0,5+0,25+0,125\right)-12,5×4\)
\(=12,5×10\)
\(=125\)
\(12,5:0,25+12,5:0,125-25\)
\(=12,5:\left(0,25-0,125\right)-25\)
\(=12,5:0,125-25\)
\(=100-25\)
\(=75\)
\(12,5:0,25+12,5:0,125-25\)
\(=12,5:\left(0,25-0,125\right)-25\)
\(=12,5:0,125-25\)
\(=100-25\)
\(=75\)
Đề bài: \(12,5+1,25\cdot55+5\cdot6,25+1,25:0,125+0,5\cdot1,25\)
\(=1.25\cdot10+1,25\cdot55+1,25\cdot5\cdot5+1,25\cdot8+1,25\cdot0,5\)
\(=1,25\cdot\left(10+55+25+8+0,5\right)\)
\(=1,25\cdot98,5\)
\(=123,125\)