8.27-1.4×0.25-1.65
=8.27-1X0.25-0.4X0.25-1.65
=8.27-(0.25+0.1+1.65)
=8.27-2
=6.27
8.27-1.4×0.25-1.65
=8.27-1.4÷4-1.65
=8.27-1.6÷4+0.2÷4-1.65
=8.27-0.4+0.05-1.65
=8.27-（0.4+1.6）
=8.27-2
=6.27
23×2×4+25×4×2+27×1×8+25×8×1 =8x（23+25+27+25） =8x100 =800
＝8.27-0.35-1.65
＝8.27-（0.35+1.65）
＝8.27-2
＝6.27