图1中□应填。
图2中□应填、。(从左向右填)
× = ÷ = - + - = - = ×( -25%)=
①51×101
② × ×
③44×1.6-0.16×40
④5.04-2.72-0.28
⑤ ÷ ×
⑥165× +165×