(26+74)-50=
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tinh nhanh
70+50+30+50+26+97+3+74
=(70+30)+(50+50)+(97+3)+(74+26)
=100+100+100+100
=400
209-134
56+78=134
78+97=175
145-74=71
12+56-34+89=68-34+89=34+89=123
70+50+30+50+26+97+3+74=(70+30)+(50+50)+(26+74)+(97+3)=100+100+100+100=400
209-134=75
210-73=137
a: \(\dfrac{25}{26}=1-\dfrac{1}{26}\)
\(\dfrac{50}{51}=1-\dfrac{1}{51}\)
mà \(-\dfrac{1}{26}< -\dfrac{1}{51}\)
nên \(\dfrac{25}{26}< \dfrac{50}{51}\)
b: \(\dfrac{149}{157}=1-\dfrac{8}{157}\)
\(\dfrac{449}{457}=1-\dfrac{8}{457}\)
mà \(-\dfrac{8}{157}>-\dfrac{8}{457}\)
nên \(\dfrac{149}{157}>\dfrac{449}{457}\)
\(\frac{x+73}{27}+1+\frac{x+74}{26}+1=\frac{x+27}{73}+1+\frac{x+26}{74}+1\)
\(\frac{x+73+27}{27}+\frac{x+74+26}{26}=\frac{x+27+73}{73}+\frac{x+26+74}{74}\)
\(\frac{x+100}{27}+\frac{x+100}{26}=\frac{x+100}{73}+\frac{x+100}{74}\)
\(\left(x+100\right)\left(\frac{1}{27}+\frac{1}{26}-\frac{1}{73}-\frac{1}{74}\right)=0\)
mà \(\frac{1}{27}+\frac{1}{26}-\frac{1}{73}-\frac{1}{74}\ne0\)
\(\Rightarrow x+100=0\Rightarrow x=-100\)
(26+74)-50
=100-50
=50
(26+74)-50
=100-50
=50
ai k mk mk k cho