\(\text{2045−(26+2019−56) }\)
\(\text{2045−(2045−56) }\)
\(\text{2045−1989 }\)
\(\text{56 }\)
\(\text{25.(78 - 125) - 125.(78 - 25)}\)
\(\text{25.−47−125.53 }\)
\(\text{25.−172.53}\)
thiếu phần b nha
Trả lời:
\(a,\)\(\left(2019+26\right)-\left[26+\left(2019-56\right)\right]\)
\(=2019+26-26-2019+56\)
\(=\left(2019-2019\right)+\left(26-26\right)+56\)
\(=56\)
\(b,\)\(\left(-8\right)\left(-5\right).125.\left(-13\right).20\)
\(=[\left(-8\right).125].\left[20.\left(-5\right)\right].\left(-13\right)\)
\(=(-1000).\left(-100\right).\left(-13\right)\)
\(=-1300000\)
\(c,\)\(25\left(78-125\right)-125\left(78-25\right)\)
\(=25.78-25.125-125.78+125.25\)
\(=\left(125.25-125.25\right)+78\left(25-125\right)\)
\(=0+78.\left(-100\right)\)
\(=-7800\)
Hok tốt!
Good girl
thx nha bn.
ps cách tích cho câu trả lời??
mình mới vào nên ko rõ
