(1)1/4乘以25.3+0.25乘以18.6-3.9乘以1/4
=1/4×(25.3+18.6-3.9)
=1/4×40
=10
(2)202²+202乘以196+98²
=202²+2×202×98+98²
=(202+98)²
=300²
=90000
(3)184.5²+184.5乘以31+15.5²
=(184.5+15.5)²
=200²
=40000
(1)1/4乘以25.3+0.25乘以18.6-3.9乘以1/4
=1/4×(25.3+18.6-3.9)
=1/4×40
=10
(2)202²+202乘以196+98²
=202²+2×202×98+98²
=(202+98)²
=300²
=90000
(3)184.5²+184.5乘以31+15.5²
=(184.5+15.5)²
=200²
=40000