1)
\((32.15):2=14(x-70)-40\)
\(15.16=14x-980-40\)
\(240=14x-1020\)
\(14x=1020+240\)
\(14x=1260\)
\(x=1260:14=90\)
2)
\(A=42.75=41.75+75\)
\(A=41.74+41+75\)
\(A=41.74+116\)
\(A>B\)
3)
\(4x5y⋮2;5;9\)
\(\Rightarrow y=0\)
\(\Rightarrow4x5y=4x50\)
\(4x50⋮9\Rightarrow4+x+5+0⋮9\Rightarrow9+x⋮9\Rightarrow x=9\)
Ta tìm được số 9450
\(\left(2x-1\right)\left(y-3\right)=29\)
\(\Rightarrow2x-1;y-3\inƯ\left(29\right)\)
\(Ư\left(29\right)=\left\{\pm1;\pm29\right\}\)
\(\Rightarrow2x-1=1\Rightarrow2x=2\Rightarrow x=1\)
\(y-3=9\Rightarrow y=12\)
\(\Rightarrow2x-1=-1\Rightarrow2x=0\Rightarrow x=0\)
\(y-3=-9\Rightarrow y=-6\)
\(\Rightarrow2x-1=9\Rightarrow2x=10\Rightarrow x=5\)
\(y-3=1\Rightarrow y=4\)
\(\Rightarrow2x-1=-9\Rightarrow2x=-8\Rightarrow x=-4\)
\(y-3=-1\Rightarrow y=2\)
