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272727/363636=272727:90909/363636:90909=3/4
6/9=6:3/9:3=2/3
12/36=12:12/36:12=1/3
60/105=60:15/105:15=4/7
42/126=42:42/126:42=1/3
75/300=75:75/300:75=1/4
272727/363636=272727:90909/363636:90909=3/4
6/9=6:3/9:3=2/3
12/36=12:12/36:12=1/3
60/105=60:15/105:15=4/7
42/126=42:42/126:42=1/3
75/300=75:75/300:75=1/4
\(=\dfrac{12000+4800}{42\left(37+63\right)}=\dfrac{16800}{42\cdot100}=\dfrac{168}{42}=4\)
\(\dfrac{240.50+48.100}{42.37+21.126}\)
\(=\dfrac{24.5.10.10+48.100}{42.37+3.7.6.21}\)
\(=\dfrac{100.100+48.100}{42.37+42.63}\)
\(=\dfrac{100.\left(100+48\right)}{42.\left(37+63\right)}\)
\(=\dfrac{100.148}{42.100}\)
\(=\dfrac{148}{42}\)
\(=\dfrac{74}{21}\)
a: 90/126=5/7<6/7
b: 70/84=5/6
35/42=5/6
=>70/84=35/42
\(42-12\)-\(\dfrac{126}{5}\)=\(30-\dfrac{126}{5}\)=\(\dfrac{150}{5}-\dfrac{126}{5}=\dfrac{24}{5}\)
24/5 là đáp án