Question

简便计算5分之4×7.7+3.3×0.8-5分之43.5×1.25+1.25+3.5÷0.88分之3×（16分之7-4分

Answer 1

（1） 5分之4×7.7+3.3×0.8-5分之4

=0.8*（7.7+3.3-1）

=0.8*10

=8

（2) 3.5×1.25+1.25+3.5÷0.8

=3.5×1.25+1.25+3.5/(1/1.25）

=3.5*1.25+1.25+3.5*1.25

=1.25*(3.5+3.5+1)

=10

(3) 8分之3×（16分之7-4分之1）÷2分之1

=3/4*3/16

=9/64

(4) [13-（4+5.6÷0.7）]÷2.5

=[13-4-8]/2.5

=1/2.5

=0.4