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脱式计算.(能简算的要简算)(1)1.25×8.37×0.8 ...

(1)1.25×8.37×0.8 =1.25×0.8×8.37,=1×8.37,=8.37;(2)(9-2.35)×0.64=6.65×0.64,=4.256;(3)0.25×32×12.5=(0.25×4)×(8×1.25),=1×10,=10;(4)0.15×1999+0.15 =(1+1999)×0.15,=2000×0.15,=300;(5)0.37×1.4-0.4×0.37=(1....

(1)1.08×0.8÷0.27=1.08÷0.27×0.8,=4×0.8,=3.2;(2)102×0.45=(100+2)×0.45,=100×0.45+2×0.45,=45+0.9,=45.9;(3)22.78÷1.25÷0.8=22.78÷(1.25×0.8),=22.78÷1,=22.78;(4)0.34×101-0.34=(101-1)×0.34,=100×0.34,=34.

(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.

①7.69×2.1+2.1×1.31+2.1=(7.69+1.31+1)×2.1=10×2.1=21②18-(1.4+1.25×2.4)=18-(1.4+1.25×8×0.3)=18-[1.4+(1.25×8)×0.3]=18-[1.4+3]=18-4.4=13.6③7.2÷1.6+0.8=4.5+0.8=5.3④4×4.5-3X=6.33 18-3x=6.38 18-3x+3x=6.33+3x 3x+6.33=183x+6.33-6...

(1)1305-386-614,=1305-(386+614),=1305-1000,=305;(2)(14+23-56)×12,=14×12+23×12-56×12,=3+8-10,=1; (3)1.25×32×2.5,=(1.25×8)×(4×2.5),=10×10,=100;(4)10.9-(45+9.6÷4),=10.9-(45+2.4),=10.9-3.2,=7.7.

44÷4又8分之5+37分之31÷111分之25+37分之36*4又25分之11=44÷8分之37+37分之31÷111分之25+37分之36*25分之111=44*37分之8+37分之31*25分之111+37分之36*25分之111=37分之352+25分之93+25分之108=37分之352+25分之201=925分之16237(3-112.5%+1又7...

(1)2.43×99+2.43,=2.43×(99+1),=2.43×100,=243;(2)25-[7.8+(6.2+1.61÷0.23)],=25-[7.8+(6.2+7)],=25-[7.8+13.2],=25-21,=4;(3)20-(2.4+2.4×1.25);=20-(2.4+3),=20-5.4,=14.6;(4)4.58+2.39+(5.42+7.61),=(4....

0.4×125×25×0.8 =(0.4×25)×(125×0.8) =10×100=1000 1.25×(8+10) =1.25×8+1.25×10 =10+12.5=22.5 9123-(123+8.8) =9123-123-8.8 =9000-8.8 =8991.2 1.24×8.3+8.3×1.76 =8.3×(1.24+1.76) =8.3×3=24.9 9999×1001 =9999×(1000+1) =9999×...

①624-298=624-(300-2)=624-300+2=324+2=326②0.8×〔13-(3.012+5.28)〕=0.8×(13-5.292)=0.8×7.708=6.1664③19.4×0.9+0.1×19.4=19.4×(0.9+0.1)=19.4×1=19.4④147+87+53+11=(147+53)+(87+11)=200+98=298⑤5.6-0.71-0.29=5.6-(0.71+0.29)=...

6.8×0.195 =6.8x0.2-6.8x0.005 =1.36-0.034 =1.326

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