Question

3道脱式计算,能简算的要简算.（要有过程）

Answer 1

(1)（3.8－1.8÷2）×0.3

=（3.8-0.9)x0.3

=2.9x0.3

=0.87

(2)2÷2/3－2/3÷2

=2x3/2-1/3

=3-1/3

=2又2/3

(3)（15－15×4/5）×7/24

=15×（1-4/5）×7/24

=15×1/5×7/24

=3×7/24

=7/8