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a) 2 x 12 x 43 + 3 x 32 x 8 + 25 x 6 x4
=(2 x12) x43+(3 x8) x32+(6 x4) x25
=24 x43+24 x32+ 24 x25
=24 x(43+32+25)
=24 x100
=2400
b) 78 x 31 + 78 x 24 + 17 x 78 + 28 x 78
=78x(31+24+17+28)
=78x100
=7800
X+78*X+25*X+X*4=78,6+121,4
X*1+78*X+25*X+X*4=200
X*(1+78+25+4)=200
X*108=200
X=200/108
x + 78*x + 25*x + x*4=78,6 + 121,4
x*(1+78+25-4)=200
x* 100 =200
x = 200:100
x = 2
\(x+78\times x+25\times x-4\times x=78,6+121,4\)
\(\Rightarrow x\times\left(1+78+25-4\right)=200\)
\(\Rightarrow x\times100=200\)
\(\Rightarrow x=200\div100\)
\(\Rightarrow x=2\)
Vậy x=2
\(\frac{\left(120+60\right)}{12}=\frac{120}{12}+\frac{60}{12}=10+5=15\)
\(78\cdot31+78\cdot17+78\cdot24+22\cdot72=78\left(31+17+24\right)+22\cdot72\)
\(=78\cdot72+22\cdot72=72\left(78+22\right)=72\cdot100=7200\)
\(997+86=997+\left(83+3\right)=\left(997+3\right)+83\)
\(=1000+83=1083\)
\(5\cdot25\cdot2\cdot37\cdot4=\left(5\cdot2\right)\cdot\left(25\cdot4\right)\cdot37\)
\(=10\cdot100\cdot37=37000\)
\(558+336+442+664=\left(558+442\right)+\left(336+664\right)\)
\(=1000+1000=2000\)
5 x 25 x 2 x 37 x 4
= ( 5 x 2 ) x ( 25 x 4 ) x 37
= 10 x 100 x 37
= 1000 x 37
= 37000
\(x\) + 78 x \(x\)+ 25 x \(x\)- \(x\)x 4 = 78,6 + 121,4
\(x\)x 1 + 78 x \(x\)+ 25 x \(x\)- \(x\)x 4 = 200
\(x\)x ( 1 + 78 + 25 - 4 ) = 200
\(x\)x 100 = 200
\(x\)= 200 : 100
\(x\)= 2
X + 78 * X + 25 * X - X * 4 = 78,6 + 121,4
X * ( 1 + 78 + 25 - 4 ) = 200
X * 100 = 200
X = 200 : 100
X = 2
Vậy X = 2
\(x\) \(\times\) 78 + \(x\) \(\times\) 25 = 1 000
\(x\) \(\times\) ( 78 + 25) = 1000
\(x\) \(\times\) 103 = 1000
\(x\) = 1000 : 103
\(x\) = \(\dfrac{1000}{103}\)
78x + 25x = 1000
<=> 103x = 1000
<=> x=\(\dfrac{1000}{103}\)