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-26 + ( -15 ) + l -16l + 26
= -26 + ( -15 ) + 16 + 26
= -26 + 26 + ( -15 ) + 16
= 0 + ( -15 ) + 16
= 1
\(\frac{\left(39+13\right)x2}{\left(84+57\right)x2}=\frac{78+26}{168+104}\)
16 + x + 84 + x với x = 26
Thay x vào phép tính , ta có:
16 + 26 + 84 + 26
= (16 + 84) + (26 x 2)
= 100 + 52
= 152
=-3/26(-15/29-2/19)
=-3/26*(-17/19)
=3/26*17/19
=51/494
\(a,\frac{47}{9}+\left(\frac{41}{3}-\frac{26}{9}\right)\)
\(=\frac{47}{9}+\left(\frac{82}{9}-\frac{26}{9}\right)\)
\(=\frac{47}{9}+\frac{56}{9}\)
\(=\frac{103}{9}\)
\(b,\frac{26}{15}:\frac{13}{5}-\frac{1}{4}\)
\(=\frac{26.5}{15.3}-\frac{1}{4}\)
\(=\frac{12}{3}-\frac{1}{4}\)
\(=\frac{4}{1}-\frac{1}{4}=\frac{16}{4}-\frac{1}{4}=\frac{15}{4}\)
Ta có: \(D=\frac{\frac{15}{6x16}+\frac{15}{16x26}+\frac{15}{26x36}}{\frac{33}{6x16}-\frac{63}{16x26}+\frac{93}{26x36}}\)
\(\Rightarrow D=\frac{15.\frac{1}{6x16}+15.\frac{1}{16x26}+15.\frac{1}{26x36}}{3.11.\frac{1}{6x16}-3.21.\frac{1}{16x26}+3.31.\frac{1}{26x36}}\)
\(\Rightarrow D=\frac{15.\left(\frac{1}{6x16}+\frac{1}{16x26}+\frac{1}{26x36}\right)}{3.\left(\frac{11}{6x16}-\frac{21}{16x26}+\frac{31}{26x36}\right)}\)
\(\Rightarrow D=5.\left(\frac{1}{6x16}+\frac{1}{16x26}+\frac{1}{26x36}\right):\left(\frac{11}{6x16}-\frac{21}{16x26}+\frac{31}{26x36}\right)\)
\(\text{-204 + 84 : 2}\)
\(=-204+42\)
\(=-162\)
\(\text{792-24.(-2) + (-692) + (-26).(-2) }\)
\(=\left[792+\left(-692\right)\right]+\left(-2\right).\left(-24-26\right)\)
\(=100+\left(-2\right).\left(-50\right)\)
\(=-100+100=0\)
chúc bạn học tốt
\(26.\left(-84\right)+\left(-26\right).15+26=26\left(-84-15+1\right)=26.\left(-98\right)=-2548.\)