975 - ( 1001 : X ) = 962
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a,456*65+456*34+456
=456*65+456*34+456*1
=456*(65+34+1)
=456*100
=45600
a) 2 022 + 1 975 = 1 975 + 2 022
b) 2 022 + 1 975 > 1 975 + 2 020
c) 2 022 + 1 975 < 1 977 + 2 022
d) 2 022 + 1 975 = 2 025 + 1972
\(\frac{x-971}{972}+\frac{x-973}{970}+\frac{x-975}{968}+\frac{x-977}{966}=\frac{x-972}{971}+\frac{x-970}{973}+\frac{x-968}{975}+\frac{x-966}{977}\)
\(\Rightarrow\frac{x-971}{972}-1+\frac{x-973}{970}-1+\frac{x-975}{968}-1+\frac{x-977}{966}-1=\frac{x-972}{971}-1+\frac{x-970}{973}-1+\frac{x-968}{975}-1+\frac{x-966}{977}-1\)\(\Rightarrow\frac{x-1943}{972}+\frac{x-1943}{970}+\frac{x-1943}{968}+\frac{x-1943}{966}=\frac{x-1943}{971}+\frac{x-1943}{973}+\frac{x-1943}{975}+\frac{x-966}{977}\)
\(\Leftrightarrow\frac{x-1943}{972}+\frac{x-1943}{970}+\frac{x-1943}{968}+\frac{x-1943}{966}-\frac{x-1943}{971}-\frac{x-1943}{973}-\frac{x-1943}{975}-\frac{x-966}{977}=0\)
\(\Leftrightarrow\left(x-1943\right).\left(\frac{1}{972}+\frac{1}{970}+\frac{1}{968}+\frac{1}{966}-\frac{1}{971}-\frac{1}{973}+\frac{1}{975}+\frac{1}{977}\right)=0\)
\(\Leftrightarrow\left(x-1943\right)=0\Leftrightarrow x=1943\)
Vậy...
998.975+975+975=998.975+975.1+975.1=975(998+1+1)=975.1000=975000
tick đúng cho mk nha
998 . 975 + 975 + 975
= 998 .975 + 975 . 1 + 975 . 1
= 975 . ( 998 + 1 + 1 )
= 975 . 1000
= 975 000
\(\text{x+630=560+962 x+630=1522 x=1522-630 x=892 }\)
39 - 975 : x = 123
975 : x = 39 - 123
975 : x = -84
x = 975 : (-84)
x = \(\dfrac{-319}{28}\)
Ta có:\(1001=1000+1=x+1\)
\(x^8-1001x^7+1001x^6+...+1001x^2-1001x+250\\ =x^8-\left(x+1\right)x^7+\left(x+1\right)x^6+...+\left(x+1\right)x^2-\left(x+1\right)x\\ =x^8-x^8-x^7+x^7+x^6+...+x^3+x^2-x^2-x+250\\ =-x+250=-1000+250\\ =-750\)
a) x - 363 = 975
x = 975 + 363
x = 1338
b) 207 + x = 815
x = 815 - 207
x = 608
m+(x+742)=(m+962)+742
=> m + x + 742 = m + 962 + 742
=> m + 742 + x = m + 742 + 962
=> x = 962 ( rút gọn m + 742 và m + 742 )
975 - ( 1001 : X ) = 962 1001 : X = 975 - 962 1001 : X = 13 X = 1001 : 13 X = 77