Tính nhanh: a) -6/13 - (1 - -7/13) b) (1/9 + -5/17) + 3/6 + (-12/17 + -1/2) + 5/9
Giải thích
a) −613−1−−713=−613−1+−713=−613+−713−1=−1−1=−2
b) 19+−517+36+−1217+−12+59=19+−517+36+−1217+−12+59=−517+−1217+19+59+36+−12=−1+23+0=−13
a) −613−1−−713=−613−1+−713=−613+−713−1=−1−1=−2
b) 19+−517+36+−1217+−12+59=19+−517+36+−1217+−12+59=−517+−1217+19+59+36+−12=−1+23+0=−13