Question

17.2÷2+2.8×0.5　　1.72÷4+2.28×0.25　怎样简便计算

Answer 1

17.2÷2+2.8×0.5

=17.2×0.5+2.8×0.5

=（17.2+2.8）×0.5

=20×0.5

=10

1.72÷4+2.28×0.25

=1.72×0.25+2.28×0.25

=（1.72+2.28）×0.25

=4×0.25

=1