A-A+
X:514=310:7204X=13:30%47÷421×X=8927×58=18÷34=1
问题详情
参考答案
(1)x:514=310:720,
720x=514×310,
720x×207=328×207,
x=1549;
(2)4X=13:30%,
13x=4×30%,
13x×3=1.2×3,
x=3.6;
(3)47÷421×x=89,
3x=89,
3x÷3=89÷3,
x=827;
(4)27×58=528;
(5)18÷34=16;
(6)125×1.6=200;
(7)12.56÷6.28=2;
(8)7×17÷7×17
=1÷7×17,
=17×17,
=149;
(9)45-13=715,
(10)3.14×5=15.7;
(11)3.14×40=125.6;
(12)75×10%=7.5;
(13)13÷3-19
=19-19,
=0.
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