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计算下面各题,注意使用简便方法 (3/4%2/3)÷1/5 (3...

能简便的用简便方法。(2/3一2/5)×(3/4÷4/5) =(2/3-2/5)*(3/4*5/4) =(2/3-2/5)*15/16 =2/3*15/16-2/5*15/16 =5/8-3/8 =2/8 =1/4

(1)2 3 4 -1.375+7.25-6 5 8 ,=2.75+7.25-(1.375+6.625),=10-8,=2;(2)888 8 9 ×1.125.=888×1.125+ 8 9 × 9 8 ,=999+1,=1000;(3)2000-1999×0.83-199.9×1.7.=2000-(1999×0.83+1999×0.17),=2000-1999×(0.83+0.17),=2000-19...

(1)32.5+3.6×2.5÷0.48,=32.5+9÷0.48,=32.5+18.75,=51.25;(2)22- 3 4 × 1 2 - 5 8 ,=22- 3 8 - 5 8 ,=22-( 3 8 + 5 8 ),=22-1,=21;(3)299÷(299+ 299 300 ),=299÷ 299×300+299 300 ,=299× 300 299×300+299 ,= 300 300+1 ,...

1. 3200÷4÷25 =3200÷(4x25) =3200÷100 =32

(1)2- 1 4 - 1 3 - 3 4 ,=2-( 1 4 + 3 4 ) - 1 3 ,=2-1- 1 3 ,=1- 1 3 ,= 2 3 ;(2)0.8+ 5 8 +0.2,=(0.8+0.2)+ 5 8 ,=1+ 5 8 ,=1 5 8 ;(3)15-5÷12- 7 12 ,=15- 5 12 - 7 12 ,=15-( 5 12 + 7 12 ),=15-1,=14;(4)7.8×...

(1)40.2-4÷80×2.4,=40.2-0.05×2.4,=40.2-0.12,=40.08;(2)34×(117+113)×13,=(34×13)×(117+113),=34×117×13+13×113×34,=2×13+1×34,=26+34,=60;(3)3.9-5.7+7.1-2.3,=(3.9+7.1)-(5.7+2.3),=11-8,=3;(4)920÷[23×(45...

(1)3.25×0.45+6.75×0.45=(3.25+6.75)×0.45=10×0.45=4.5;(2)9.07-22.78÷3.4=9.07-6.7=2.37;(3)7.5×102=7.5×(100+2)=7.5×100+7.5×2=750+15=765;(4)5.64÷0.125÷8=5.64÷(0.125×8)=5.64÷1=5.64;(5)16×0.7×2.5=4×4×0.7×2.5=(4×0....

(1)2.3+3.91÷(22-19.7)=2.3+3.91÷2.3=2.3+1.7=4(2)21.6÷[64.8-(48.6-2.7×2)]=21.6÷[64.8-(48.6-5.4)]=21.6÷[64.8-43.2]=21.6÷21.6=1(3)0.25×0.03×4 =(0.25×4)×0.03=1×0.03=0.030.13×3.89+0.13×5.11 =0.13×(3.89+5.11)=0.13×9=1....

(1)4.05÷0.5+10.75=8.1+10.75=18.85(2)21.6÷0.8-1.2×5=27-6=21(3)6.8×2.7+2.7×3.2=(6.8+3.2)×2.7=10×2.7=27(4)8.4×6.9÷(6.44-4.14)=8.4×6.9÷2.3=8.4×(6.9÷2.3)=8.4×3=25.2(5)0.38×102 =0.38×(100+2)=0.38×100+0.38×2 =38+0.76...

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