[tex]A)a = ( {1.1}^{2} + {1.2}^{2} - {1.3}^{2} ) \div 4 + 6 \div {10}^{2} [/tex]
[tex]a = (1.21 + 1.44 - 1.69) \div 4 + 6 \div 100[/tex]
[tex]a = 0.96 \div 4 + 0.06[/tex]
[tex]a = 0.24 + 0.06[/tex]
[tex]a = 0.3[/tex]
[tex]b = (26 \div 2.6 - 1.8 \div 0.3) \div (21.19 - 0.3 - 0.89)[/tex]
[tex]b = (10 - 6) \div 20[/tex]
[tex]b = 4 \div 20[/tex]
[tex]b = 0.2[/tex]
[tex]B) {a}^{2} + {b}^{2} = {0.3}^{2} + {0.2}^{2} = 0.09 + 0.04 = 0.13[/tex]
[tex] {a}^{2} - {b}^{2} = {0.3}^{2} - {0.2}^{2} = 0.09 - 0.04 = 0.05[/tex]
[tex]C) {(a + b)}^{2} = {a}^{2} + 2ab + {b}^{2} = {0.3}^{2} + 2 \times 0.3 \times 0.2 + {0.2}^{2} = 0.09 + 0.12 + 0.04 = 0.25[/tex]
[tex]D) {(a - b)}^{2} = {a}^{2} - 2ab + {b}^{2} = {0.3}^{2} - 2 \times 0.3 \times 0.2 + {0.2}^{2} = 0.09 - 0.12 + 0.04 = 0.01[/tex]
