Question

谁能帮我解下列数学题？要简便算法！

(1)2.3*百分之12.5+5.7*8分之1
(2)1又4分之1*5分之2+3又4分之3+2又2分之1
(3)12又2分之1/1又3分之1+87.5*4分之3

Answer 1

(1)2.3*百分之12.5+5.7*8分之1
=2.3×1/8+5.7×1/8
=(2.3+5.7)×1/8
=8×1/8
=1

(2)1又4分之1*5分之2+3又4分之3+2又2分之1
=5/4×2/5 + 15/4 + 5/2
=2/4 + 15/4 + 10/4
=27/4

(3)12又2分之1/1又3分之1+87.5*4分之3
=25/2÷4/3 + 175/2×3/4
=25/2×3/4 + 525/8
=75/8+525/8
=600/8
=75

Answer 2

＝（2.3＋5.7）*0.125 =1
=1.25*1.5+3.75+2.5
=3.75+3.75/2+2.5
=8.125

=12.5*3/4+12.5*7*3/4
=12.5*8*3/4
=75

Answer 3

(1)2.3*百分之12.5+5.7*8分之1
=2.3*8分之1+5.7*8分之1
=(2.3+5.7)*8分之1
=8*8分之1
=1
(2)1又4分之1*5分之2+3又4分之3+2又2分之1
=4分之5*5分之2+3又4分之3+2又2分之1
=2分之1+3又4分之3+2又2分之1
=3又4分之3+3
=6又4分之3
(3)12又2分之1/1又3分之1+87.5*4分之3
=12.5*4分之3+87.5*4分之3
=(12.5+87.5)*4分之3
=100*4分之3
=75

Answer 4

(1)=2.3*12.5%+5.7*12.5%=(2.3+5.7)*12.5%=1
(2)=5/4*2/5+15/4+5/2=(2+15+10)/4=27/4
(3)=25/2*3/4+87.5*3/4=12.5/3/4+87.5*3/4=100*3/4=75