简便计算

5分之4×7.7+3.3×0.8-5分之4
=0.8X（7.7+3.3-1）
=0.8X10
=8
3.5×1.25+1.25+3.5÷0.8
=3.5×1.25+1.25+3.5/(1/1.25）
=3.5X1.25+1.25+3.5X1.25
=1.25X(3.5+3.5+1)
=10
8分之3×（16分之7-4分之1）÷2分之1
=3/4X3/16
=9/64
[13-（4+5.6÷0.7）]÷2.5
=[13-4-8]/2.5
=1/2.5
=0.4

（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本回答被提问者采纳