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( )/2.4=3.6/1.2 7.5/( )=2.5/12 2.7/( )=3/9 1.6/...

4/3=( 3 )比( 4 )=( 75 )%=(0.75 )

( 7.2)/2.4=3.6/1.2 7.5/(36 )=2.5/12 2.7/(8.1 )=3/9 1.6/ ( 1.2)=0.5/3/8 5/0.3=25 ( 1.5) 5.4/6.3=18/ (21 ) 4分之3=(3 )比(4 )=( 75% )=(0.75 ) 95%=( 95 )/(100 )=( 19 )比( 20 )

7.5x2.3+1.9x2.5+12.5x0.4 =2.5x3x2.3+1.9x2.5+2.5x5x0.4 =2.5x(6.9+1.9+2) =2.5x10.8 =2.5x(10+0.8) =2.5x10+2.5x0.8 =25+2 =27

6.4×0.2+3.6×0.2= 6.25×8= (1.5+0.25)×4= 2.14-0.9= 2.87÷0.7= 1.2×0.4+1.3×0.4= 7.2×0.3+2.8×0.3= 4.9÷3.5= ...

第一个数是2的n-1次方 第二个数是等差数列3n-1 第三个数的通项是an=3+2^1+2^2+2^3+.....+2的n-1次方

(1)2.5+7.5÷5,=2.5+1.5,=4;(2)12.6+4.5÷3-12.7,=12.6+1.5-12.7,=14.1-12.7,=1.4;(3)9999×2222+3333×3334,=(3333×3)×2222+3333×3334,=3333×(3×2222)+3333×3334,=3333×(6666+3334),=3333×10000,=33330000;(4)2.9×6.7+2...

(1)(3.8+12)-(35+2.4÷223)=4.3+1.5,=5.8;(2)(278-2.625)÷0.5%=0.25÷0.005=50;(3)1.9×5-(2.5+127)=9.5-31114,=912-31114,=557;(4)613×1.2+1×323=7.6+323,=735+323,=11415;(5)(314-112)÷312+512,=134÷312+512,=74×...

1.(-1/3)-(-1/2)+3/4+(-2/3) %D%A=(-1/3-2/3)+(1/2+3/4)%D%A=-1+5/4%D%A=1/4%D%A%D¢.1.36-(-2.64+5.2)-0.2 %D%A=(1.36+2.64)-(5.2+0.2)%D%A%D%A=4-5.4%D%A=-1.4%D%A%D£.3又7/45+12又4/13-9又2/5+7又5/26 %D%A=(3又7/45-9又2/5)+(12又4...

=(2.5x4)x9x(12.5x8) =10x9x100 =9000 1/2÷[1-(3/9+5/9)] =1/2÷1/9 =9/2 =4.5

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