16比40少%,40比16多%。
+ = 0.77+0.33= ×4+4× = - ×0=
24×25% = a- a= 1÷ × = 3÷ ×3÷ =
①( - ÷4)×
② ×99+
③2.7÷(1-20%-50%)
④(6.7×60%+3.3×60%)÷
⑤10×( - ÷37.5%)