A:π
B:12 π
C:14 π
D:2π
若代数式2x-2和32x+1的值相等,则x的值为( )
486﹣186=____ 250+250=____ 0.25×0.8=____ 4.2÷6=____
12+13 =____ 13−15 =____ 24× 38 =____ 21÷ 37 =____