Tính a) (2/5 + 1/2)^2; b) (0,75 - 1 1/2)^3; c) (3/5)^15 : (0,36)^5
Giải thích
a) 25+122=410+5102=9102=92102=81100
b)0,75−1123=75100−323=34−323=34−643=−343=−3343=−2764
3515:0,365=3515:361005=3515:9255=315515:32525=3515:322.5=3515:3510=3515−10=355=3555=2433125.
d) 1−138:493=238:2323
=238:232.3=238:236
=238−6=232=2232=49.