Tính hợp lí a) -4/7 . 5/11 + -4/7 . 6/11 + 2 4/7 b) (1/4 + 11/9) : 34/5 + (-2/9 + 29/4)
Giải thích
a) −47.511+−47.611+247=−47.511+611+187=−47.1+187=−47+187=147=2.
b) 14+119:345+−29+294:345=14+119.534+−29+294.534=534.14+119+−29+294=534.14+294+119+−29=534.304+99=534.152+1=534.172=54.