tính nhanh
103 + 104 x 22
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104 \(\times\) 125
= 13 \(\times\) 8 \(\times\) 125
= 13 \(\times\) (8 \(\times\) 125)
= 13 \(\times\) 1000
= 13 000
b, 22 \(\times\) 45
= 2 \(\times\) 11 \(\times\) 5 \(\times\) 9
= (2 \(\times\) 5) \(\times\) (11 \(\times\) 9)
= 10 \(\times\) 99
= 990
c, 50 \(\times\) 12
= 50 \(\times\) 2 \(\times\) 6
= 100 \(\times\) 6
= 600
d, 250 \(\times\) 16
= 250 \(\times\) 4 \(\times\) 4
= 1000 \(\times\) 4
= 4000
\(12-14-16+18-20-22+...+102-104-106\\ =\left(12-14-16\right)+\left(18-20-22\right)+...+\left(102-104-106\right)\\ =-18+\left(-24\right)+\left(-30\right)+...+\left(-108\right)\\ =16.\left[-18+\left(-108\right)\right]:2\\ =16.\left(-126\right):2\\ =-2016:2\\ =-1008\)
\(\frac{x+11}{115}+\frac{x+22}{104}=\frac{x+33}{93}+\frac{x+44}{82}\)
\(\Leftrightarrow\frac{1+\left(x+11\right)}{115}+\frac{1+\left(x+22\right)}{104}=\frac{1+\left(x+33\right)}{93}+\frac{1+\left(x+44\right)}{82}\)
\(\Leftrightarrow\frac{x+126}{115}+\frac{x+126}{104}=\frac{x+126}{93}+\frac{x+126}{82}\)
\(\Leftrightarrow\left(x+126\right).\left(\frac{1}{115}+\frac{1}{104}+\frac{1}{93}+\frac{1}{82}\right)=0\)
\(\Leftrightarrow x+126=6\Leftrightarrow x=-126\)vì\(\frac{1}{115}+\frac{1}{104}+\frac{1}{93}+\frac{1}{82}\ne0\)
vậy x=-126
1
23/ 27 > 22/ 29
2
43, 57 x 2,6 x [ 630 - 315 x 2] = 43,57 x 2 ,6 x [ 630 - 630]
= 42,57 x 2,6 x 0
= 110, 682 x0
= 0
Ta có: \(\frac{x+11}{115}+\frac{x+22}{104}=\frac{x+33}{93}+\frac{x+44}{82}\)
\(\Rightarrow\left(\frac{x+11}{115}+1\right)+\left(\frac{x+22}{104}+1\right)=\left(\frac{x+33}{93}+1\right)+\left(\frac{x+44}{82}+1\right)\)
\(\Rightarrow\frac{x+126}{115}+\frac{x+126}{104}=\frac{x+126}{93}+\frac{x+44}{82}\)
\(\Rightarrow\frac{x+126}{115}+\frac{x+126}{104}-\frac{x+126}{93}-\frac{x+126}{82}=0\)
\(\Rightarrow\left(x+126\right).\left(\frac{1}{115}+\frac{1}{104}+\frac{1}{93}+\frac{1}{82}\right)=0\)
\(\Rightarrow x+126=0\)( vì \(\frac{1}{115}+\frac{1}{104}+\frac{1}{93}+\frac{1}{82}\ne0\) )
\(\Rightarrow x=-126\)
vậy \(x=-126\)
\(\left(\frac{x+11}{115}+1\right)+\left(\frac{x+22}{104}+1\right)=\left(\frac{x+33}{93}+1\right)+\left(\frac{x+44}{82}\right)\)
<=> \(\frac{x+126}{115}+\frac{x+126}{104}=\frac{x+126}{93}+\frac{x+126}{82}\)
<=> \(\left(x+126\right)\left(\frac{1}{115}+\frac{1}{104}-\frac{1}{93}-\frac{1}{82}\right)=0\)
<=> x+126=0
<=>x=-126
103 + 104 x 22
= 1000 + 10000 x 4
= 1000 + 40000
= 41000
\(\text{103 + 104 x 22 = 1000 + 10000 x 4 = 1000 + 40000 = 41000 }\)
bn STY tag kiếm điểm, cho chép bài tí