X =56+1
X=57-19
X=38+10
X=48
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a: =-48+27+56-48-27-36
=-96-9
=-105
b: =23-57+57-33
=-10
57 \(\times\) 46 + 57 \(\times\) 54
= 57 \(\times\) ( 46 + 54)
= 57 \(\times\) 100
= 5700
137 + 355 + 63 + 45
= ( 137 + 63) + ( 355 + 45)
= 200 + 400
= 600
215 \(\times\) 48 - 215 \(\times\) 38
= 215 \(\times\) ( 48 - 38)
= 215 \(\times\) 10
= 2150
4 \(\times\) 50 \(\times\) 25
= ( 4 \(\times\) 25) \(\times\) 50
= 100 \(\times\) 50
= 5 000
57×(46+54) =57×100=5700
137+355+63+45=(137+63) +(355+45) =200+400=600
215×48-215×38=215×(48-38) =215×10=2150
4×50×25=(4×25) ×50=100×50=5000
a: =-48+27+56-48-27-36
=-96+20
=-76
b: =23-57+57-33=-10
c: =-98+12-159-12-41
=-98-200
=-298
\(10x^2-19x=33\)
\(\Rightarrow10x^2-19x-33=0\)
\(\Rightarrow10x^2-30x+11x-33=0\)
\(\Rightarrow10x\left(x-3\right)+11\left(x-3\right)=0\)
\(\Rightarrow\left(x-3\right)\left(10x+11\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x-3=0\\10x+11=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=3\\10x=-11\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=3\\x=-1,1\end{matrix}\right.\)
Vậy..............
\(10x^2-19x=33\)
\(\Leftrightarrow10x^2-19x-33=0\)
\(\Leftrightarrow10x^2-30x+11x-33=0\)
\(\Leftrightarrow10x\left(x-3\right)+11\left(x-3\right)=0\)
\(\Leftrightarrow\left(10x+11\right)\left(x-3\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}10x+11=0\\x-3=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{-11}{10}\\x=3\end{matrix}\right.\)
Vậy \(x=\dfrac{-11}{10}\) hoặc x = 3
\(x^2-19x-56=0\)
\(\Leftrightarrow x^2-19x=56\)
\(\Leftrightarrow x^2-19x+\frac{361}{4}=56+\frac{361}{4}\)
\(\Leftrightarrow x^2-2.x.\frac{19}{2}+\left(\frac{19}{2}\right)^2=\frac{585}{4}\)
\(\Leftrightarrow\left(x-\frac{19}{2}\right)^2=\frac{585}{4}\)
\(\Leftrightarrow\left(x-\frac{19}{2}\right)^2=\left(\pm\sqrt{\frac{585}{4}}\right)^2\)
\(\Leftrightarrow\left[{}\begin{matrix}x-\frac{19}{2}=\sqrt{\frac{585}{4}}\\x-\frac{19}{2}=-\sqrt{\frac{585}{4}}\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}x-\frac{19}{2}=\frac{\sqrt{585}}{2}\\x-\frac{19}{2}=-\frac{\sqrt{585}}{2}\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}x=\frac{\sqrt{585}+19}{2}\\x=\frac{-\sqrt{585}+19}{2}\end{matrix}\right.\)
a) \(\left(-48\right)+127+\left(-52\right)+73\)
\(=\left(-48-52\right)+\left(127+73\right)\)
\(=-100+200\)
\(=100\)
b) \(\left(-38\right)\cdot45+\left(-38\right)\cdot55\)
\(=\left(-38\right)\cdot\left(45+55\right)\)
\(=\left(-38\right)\cdot100\)
\(=-3800\)
c) \(\left(-125\right)+371+\left(-875\right)+629+150\)
\(=\left(-125-875\right)+\left(371+629\right)+150\)
\(=-1000+1000+150\)
\(=150\)
d) \(271+\left(-392\right)+729+\left(-608\right)+\left(-123\right)\)
\(=\left(271+729\right)+\left(-392-608\right)-123\)
\(=1000-1000-123\)
\(=-123\)
e) \(\left(-48\right)\cdot25+25\cdot\left(-52\right)\)
\(=25\cdot\left(-48-52\right)\)
\(=25\cdot-100\)
\(=-2500\)
f) \(47\cdot\left(-11\right)+47\)
\(=47\cdot\left(-11+1\right)\)
\(=47\cdot-10\)
\(=-470\)
g) \(56-7\cdot8+11\)
\(=56-56+11\)
\(=0+11\)
\(=11\)
h) \(-42+51+2+\left(-11\right)+40\)
\(=\left(-42+2\right)+\left(51-11\right)+40\)
\(=-40+40+40\)
\(=0+40\)
\(=40\)
a: =-48-52+127+73
=200-100
=100
b; \(=-38\left(45+55\right)=-38\cdot100=-3800\)
c: \(=-125-875+371+629+150\)
=-1000+1000+150
=150
d: =271+729-392-608-123
=1000-1000-123
=-123
e: =25(-48-52)
=25*(-100)
=-2500
f: =47(-11+1)
=47(-10)
=-470
g: =56-56+11
=11
h: =-42+2+51-11+40
=-40+40+40
=40
X =56+1 = 57
X=57-19 = 36
X=38+10 = 48
X=48
Trả lời:
x = 56 + 1 = 57
x = 57 - 19 = 38
x = 38 + 10 = 48
x = 48