Question

用简便方法计算(3.14+2.6)x(1-o.75)

用简便方法计算(3.14+2.6)x(1-o.75)

Answer 1

(3.14+2.6)X(1-0.75)
(1).=(5.74/4)X0.25X4=1.435X1=1.435
(2).=(1.435X4)X0.25
=1.435X4X0.25
=1.435X1
=1.435

Answer 2

(3.14+2.6)X(1-0.75)
=5.74X(1/4)
=1.435