`(2/5-1/2)^2 - 2 1/5 : (-11)/15`
`=(4/10 - 5/10)^2 - 2 1/5 xx (-15)/11`
`=(-1/10)^2 - 2 1/5 xx (-15)/11`
`=1/100 - 11/5 xx (-15)/11`
\(=\dfrac{1}{100}-\dfrac{11.\left(-15\right)}{5.11}\)
`=1/100 - (-15)/5`
`=1/100 + 15/5`
`=1/100 + 3`
`=301/100`
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\(\dfrac{25^{45}.5^{43}}{125^{44}}\)
\(=\dfrac{5^{90}.5^{43}}{5^{132}}\)
\(=\dfrac{5^{90+43}}{5^{132}}\)
\(=\dfrac{5^{133}}{5^{132}}\)
\(=5^1\)
`=5`
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\(\sqrt{25}-\sqrt{49}+\sqrt{100}\)
`=5 - 7 + 10`
`=8`
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