Ta có :
\(A=\left(-377\right)-\left(98-277\right)\)
\(A=\left(-377\right)-98+277\)
\(A=\left(-377\right)+\left(-98\right)+277\)
\(A=\left[\left(-377\right)+277\right]+\left(-98\right)\)
\(A=\left(-100\right)+\left(-98\right)\)
\(A=-198\)
Ta có :
\(B=\left(-1,7\right).2,3+1,7.\left(-3,7\right)-1,7.3-0,17:0,1\)
\(B=1,7.\left(-2,3\right)+1,7.\left(-3,7\right)-1,7\)
\(B=1,7\left[\left(-2,3\right)+\left(-3,7\right)-3-1\right]\)
\(B=1,7\left[\left(-2,3\right)+\left(-3,7\right)+\left(-3\right)+\left(-1\right)\right]\)
\(B=1,7.\left(-10\right)=-17\)
~ Học tốt ~