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[ 61 + ( 53 - x ) ] x 17 = 1785
61 + 53 - x = 1785 : 17
114 - x = 105
x = 114 - 105
x = 9
\(\left[61+\left(53-x\right)\right].17=1785\)
\(\Leftrightarrow61+\left(53-x\right)=105\)
\(\Leftrightarrow53-x=44\Leftrightarrow x=9\)
X=(1800+600):30):560:(315:35)
X=(2400:30):560:9
X=80:560:9
X=80x1/560x1/9
X=1/7x1/9
X=1/63
A=58x72+63x81-58x52-63x61
= (58x72-58x52)+(63x81-63x61)
= 58(72-52)+63(81-61)
= 58x20+63x20
= 1160+1260
= 2420
24/53 + 75/61 - 24/53 - 14/61
= (24/53 - 24/53) + (75/61 - 14/61)
= 0 + 61/61
= 61/61 = 1
K cho mik nha~ ;w;
12 x 53 + 53 x 17 - 53 x 84
= 53 x ( 12 + 17 - 84 )
= 53 x - 29
= -2915
\(\frac{31}{53}.\frac{17}{28}+\frac{31}{28}.\frac{11}{53}\)
\(=\frac{31}{53}.\frac{17}{28}+\frac{11}{28}.\frac{31}{53}\)
\(=\frac{31}{53}.\left(\frac{17}{28}+\frac{11}{28}\right)\)
\(=\frac{31}{53}.1\)
\(=\frac{31}{53}\)
\(\frac{31}{53}\times\frac{17}{28}+\frac{31}{28}\times\frac{11}{53}\)
\(=\frac{31}{53}\times\frac{17}{28}+\frac{31}{53}\times\frac{11}{28}\)
\(=\frac{31}{53}\times\left(\frac{17}{28}+\frac{11}{28}\right)\)
\(=\frac{31}{53}\times1\)
\(=\frac{31}{53}\)
=> 53-x= 105 -61=44
=> x=53-44=9