[(2x+y)2﹣(2x+y)(﹣y+2x)]÷2y,其中x=4,y=5.
68×268+68
19219×19
53= 103=
203= 0.13=
1 ÷0.15= 4.6+4= 3- =
2013+67= 63= 10.1-1=
= ×2÷ ×2=
2019﹣128= 10﹣0.86= 20×0.8= 100÷20%=
10÷0.5= ﹣0.375= ×0.81= 52﹣32=
0.125×5×0.8= 13÷91= 3.14×8= 4.5﹣4.5÷15=
6﹣2 = = ÷32%= ×8÷ ×8=
0.54÷0.9= 3-0.06= 0.21×0.3= + = ÷ =
-60%= +37.5%= 0.32= 499+303≈ 564÷79≈
= 27÷80%= = =
52= 92= 62= 122= 142= 11=