4x-3×8=12 x:6=2.5:1.5
2.4×=
1.6÷8%=
÷×=
0.25×32×0.125=
-=
3.14×(0.4÷2)2=
2.72+3-2.72+3=
1-0.09=
3.14×20= 2×= 1+= ()×9=
72÷= 1.5×100= 1.25×8= 99×0.8+0.8=
2x-4×0.5=1
x+20%x= 36
①0.7∶18=21∶x
②
③∶x=2∶5
④∶=∶x
⑤
⑥