a) 1221 : ( x - 16 ) = 21
( x - 16 ) = 1221 : 21
x - 16 = 58,142..
x = 58,142 + 16
x = 74,142...
b) 435 + ( 6x - 8 ) = 457
( 6x - 8 ) = 457 - 435
6x - 8 = 22
6x = 22 + 8
6x = 30
x = 30 : 6
x = 5
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a, 1221:(x-16)=21
x-16=1221:21
x-16=\(\frac{407}{7}\)
x=\(\frac{407}{7}+16=\frac{519}{7}\)
b,435+(6x-8)=21
6x-8=21-435
6x-8=-414
6x=-414+8
6x=-406
x=-406:6
x=\(-\frac{203}{3}\)
c, 7x-7=714
7x=714+7
7x=721
x=721:7=103
d, x:2=x:3
\(\Rightarrow\frac{x}{2}=\frac{x}{3}\)
\(\Rightarrow\)không thể tìm giá trị x
k ủng hộ nha
a)x-16=1221:21
x-16=58,14
x=74,14
b)6x-8=22
6x=30
x=5
c)7x=721
x=103
d)x:2-x:3=0
x:(2-3)=0
-x=0=>x=0