Đáp án:
(310−415−720)+−519(114+17−−335).43=(1860−1660−2160)+−519(15210+30210−−18210).43=−1960+−519.63210.43=−1960+−338.43=−1960+−219=−3611140+−1201140=−4811140
2) 𝑥+42000+𝑥+32001+𝑥+22002+𝑥+12003x+{\color{#c92786}{\frac{4}{2000}}}+x+\frac{3}{2001}+x+\frac{2}{2002}+x+\frac{1}{2003}x+20004+x+20013+x+20022+x+20031𝑥+1500+𝑥+32001+𝑥+22002+𝑥+12003