X × 99 + X = 300
X × 123 - 245 = 7012
X × 124 - 2568 = 5988
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\(\Leftrightarrow\left(\dfrac{x-11}{111}+1\right)+\left(\dfrac{x-12}{112}+1\right)=\left(\dfrac{x-23}{123}+1\right)+\left(\dfrac{x-24}{124}+1\right)\)
=>x+100=0
=>x=-100
679+679x123-679x24
=679x1+679x123+679x24
=679x(1+123-24)
=679x100
=67900
245x327-245x18-9x245
=245x(327-18-9)
=245x300
=73500
679 +679 x 123 - 679 x 24
= 679 x ( 1 + 123 - 24 )
= 679 x 100
= 67900
245 x 327 - 245 x 18 - 9 x 245
= 245 x ( 327 - 18 - 9 )
= 245 x 300
= 73500
a)
\(a=2136\times2136=2136\times\left(2134+2\right)=2136\times2134+2136\times2\)
\(b=2134\times2138=2134\times\left(2136+2\right)=2134\times2136+2134\times2\)
Vì \(2136\times2>2134\times2\)
=> \(a>b\)
b)
=> \(a=b\)\(b=123\times246+77-=123\times\left(245+1\right)+77=123\times245+123+77=123\times245+200\)\(a=245\times124-45=245\times\left(123+1\right)-45=245\times123+245-45=245\times123+200\)
a) 36 x 532 + 63 x 532 + 532
= 532 x (36 + 63 + 1)
= 532 x 100
= 53200
b) 679 + 679 x 123 - 679 x 24
= 679 x (1 + 123 - 124)
= 679 x 0
= 0
c) 245 x 327 - 245 x 18 - 9 x 245
= 245 x (327 - 18 - 9)
= 245 x 300
= 73500
a)
\(36\times532+63\times532+532\)
\(=36\times532+63\times532+532\times1\)
\(=532\times\left(36+63+1\right)\)
\(=532\times100\)
\(=53200\)
b)
\(679+679\times123-679\times24\)
\(=679\times1+679\times123-679\times24\)
\(=679\times\left(1+123-24\right)\)
\(=679\times100\)
\(=67900\)
c)
\(245\times327-245\times18-9\times245\)
\(=245\times\left(327-18-9\right)\)
\(=245\times300\)
\(=73500\)
Ta có :
\(121.124=\left(123-2\right)\left(123+2\right)=123^2-2^2< 123^2\)
\(\Rightarrow A< B\)
Hướng dẫn giải:
36 x 43 = 1548
123 x 25 = 3075
245 x 34 = 8330
x + 123 = 985
x = 985 - 123
x = 862
x - 124 = 857
x = 857 + 124
x = 981
x+123=985 =>x=985-123 =>x=862
x-124=857 =>x=857+124 =>x=981
X x 99 + X = 300
\(\Rightarrow\)X x 100 = 300
\(\Rightarrow\)X = 3
X x 123 - 245 = 7012
\(\Rightarrow\)X x 123 = 7257
\(\Rightarrow\)X = 7257 : 123
\(\Rightarrow\)X = 59
X x 124 - 2568 = 5988
\(\Rightarrow\)X x 124 = 8556
\(\Rightarrow\)X = 8556 : 124
\(\Rightarrow\)X = 69
X x 99 + X = 300
X x ( 99 + 1 ) = 300
X x 100 = 300
X = 300 : 100
X = 3
X x 123 - 245 = 7012
X x 123 = 7012 + 245
X x 123 = 7257
X = 7257 : 123
X = 59
X x 124 - 2568 = 5988
X x 124 = 5988 + 2568
X x 124 = 8556
X = 8556 : 124
X = 69