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脱式计算(能简算的要简算)(1)1.8×2.58+0.5+1.4...

(1)1.8×2.58+0.5+1.42×1.8=1.8×(2.58+0.5+1.42)=1.8×4.5=8.1(2)(54.7-17.5)×(0.45÷0.9)=37.2×0.5=18.6(3)52.91-311113-18213=52.91-(311113+18213)=52.91-50=2.91(4)15-8811+212=(15-8+2)-(811-12)=9-522=81722

1.8÷0.5=1.8÷(1÷2)=1.8÷1*2=1.8*2=3.6

(7.7×2.1×0.54)÷(5.4×12.1×0.42) =7.7×2.1×0.54÷5.4÷12.1÷0.42 =7.7÷12.1×(2.1÷0.42)×(0.54÷5.4) =7÷11×5×0.1 =7/22

(1)49×[34-(716-14)]=49×[34-316]=49×916=14;(2)6.25×0.56+58×3.4+5×18=6.25×0.56+58×3.4+5×18=0.625×5.6+0.625×3.4+0.625=0.625×(5.6+3.4+1)=0.625×10=6.25;(3)6.72-2.3÷0.5×0.8=6.72-4.6×0.8=6.72-3.68=3.04;(4)2007÷200720072...

①12.5×0.4×2.5×8=(12.5×8)×(0.4×2.5)=100×1=100②9.5×101=9.5×(100+1)=9.5×100+9.5=959.5③43.2-1.8×3-4.6=43.2-5.4-4.6=43.2-(5.4+4.6)=33.2④4.2×7.8+2.2×4.2=4.2×(7.8+2.2)=4.2×10=42⑤0.87×3.16+4.64=2.7492+4.64=7.3892⑥12.5×4.8=12....

(1)6.72-2.3÷0.5×0.8=6.72-4.6×0.8=6.72-3.68=3.04;(2)98-17+18-67=(98+18)-(17+67)=54-1=14;(3)910÷[12×(65-310)]=910÷[12×910]=910÷920=2;(4)(27+15)×7×5=27×7×5+15×7×5=10+7=17.

(1)1.8×5.46+1.8×4.54=1.8×(5.46+4.54)=1.8×10=18;(2)4×0.8×12.5×2.5=4×2.5×0.8×12.5=(4×2.5)×(0.8×12.5)=10×10=100;(3)9.07-22.78÷3.4=9.07-6.7=2.37.

(1)1.08×0.8÷0.27=1.08÷0.27×0.8,=4×0.8,=3.2;(2)2.6×1.7+1.4×1.7=(2.6+1.4)×1.7,=4×1.7,=6.8;(3)0.4×63×2.5=0.4×2.5×63,=1×63,=63.

(1)0.88×4.9+5.1×0.88,=0.88×(4.9+5.1),=0.88×10,=8.8;(2)4.7×10.2,=4.7×(10+0.2),=4.7×10+4.7×0.2,=47+0.94,=47.94;(3)3.24×1.6÷0.27,=5.184÷0.27,=19.2.

(1)9.4÷[(1.2+1.3)÷0.25]=9.4÷[2.5÷0.25]=9.4÷10=0.94(2)(1.2+1.8×4)×(7-6.75=(1.2+7.2)×0.25=8.4×0.25=2.1(3)2.65×1.7+13.5×0.17=2.65×1.7+1.35×1.7=(2.65+1.35)×1.7=4×1.7=6.8(4)20.4-0.8×0.4-0.68=20.4-0.32-0.68=20.4-(0....

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