1.30×(1/5+1/3) 2.2/3×5/7+2/3×2/7 3.3/4×1/9+1/4÷9 4.5-(6/7÷3/14+3/16)求大神帮助
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1.30×(1/5+1/3)2.2/3×5/7+2/3×2/73.3/4×1/9+1/4÷94.5-(6/7÷3/14+3/16)求大神帮助1.30×(1/5+1/3)2.2/3×5/7+2/3×2/
1.30×(1/5+1/3) 2.2/3×5/7+2/3×2/7 3.3/4×1/9+1/4÷9 4.5-(6/7÷3/14+3/16)求大神帮助
1.30×(1/5+1/3) 2.2/3×5/7+2/3×2/7 3.3/4×1/9+1/4÷9 4.5-(6/7÷3/14+3/16)求大神帮助
1.30×(1/5+1/3) 2.2/3×5/7+2/3×2/7 3.3/4×1/9+1/4÷9 4.5-(6/7÷3/14+3/16)求大神帮助
1.30×(1/5+1/3) =30×1/5+30×1/3 =6+10 =16 2.2/3×5/7+2/3×2/7 =2/3×(5/7+2/7) =2/3×1 =2/3 3.3/4×1/9+1/4÷9 =(3/4+1/4)×1/9 =1×1/9 =1/9 4.5-(6/7÷3/14+3/16) =5-4-3/16 =1-3/16 =13/16
1.30×(1/5+1/3) 2.2/3×5/7+2/3×2/7 3.3/4×1/9+1/4÷9 4.5-(6/7÷3/14+3/16)求大神帮助
(+5又6分之5)+(-3又7分之1)+(-6又6分之1)+(-15又7分之6)(+5又6分之5)+(-3又7分之1)+(-6又6分之1)+(-15又7分之6)(-8.62)+(+3.29)+(-6.38)+(-7.29)(+5.3)+(-2.2)
(1+1/2)(1+1/3)(1+1/4)(1+1/5)……(1+1/2005)(1+1/2006)=?
(1+1/2+1/3+1/4)×(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)×(1/2+1/3+1/4)
请猜想1+3+5+7+9+……+(2n+1)+(2n+3)=?
1、1+2+3=2×3 2、1+2+3+4+5=3×5 3、1+2+3+4+5+6+7=( )×( ) 4、11+12+13+14+15+16+17=( )×( )=( ) 5、25+26+27+28+29+30+31+32+33=( )×( )=( )再仿照
简便计算 一定要有过程.16(1/2 + 1/3 + 1/4 + 1/5)×(1/3 + 1/4 + 1/5 + 1/6)-(1/2 + 1/3 + 1/4 + 1/5 + 1/6)×(1/3 + 1/4 + 1/5)
计算:(- 1/7)+3/5+4/7+(- 1/5)
(1+1×3/1)(1+2×4/1)(1+3×5/1)……(1+99×101/1)
1.(1.3×3.9×11.7+3×9×27+1/17×3/17×9/17)/(1.3×2.6×3.9+3×6×9+1/17×2/17×3/17)2.2/3+2/9+2/27+2/81+2/2433.1+2+3+4+5+6+7+8+9+8+7+6+5+4+3+2+1/999999999²4.2×3×4×5+5×6×7×8/2×3×4×55.(1
计算:(+1)+(-3)+(+5)+(-7)+⋯+(+97)+(-99)
计算(3+4/5)×1234+7777÷35/186+543.2×38和1/5+1/(5×5)+1/(5×5×5)+1/(5×5×5×5)+1/(5×5×5×5×5)
1+(1/1+2)+(1/1+2+3)+…+(1/1+2+3+4+…+50)用简便算法第二道.(1/2×3×4)+(1/3×4×5)+(1/4×5×6)+…+(1/8×9×10)用简便算法.还有一道【(5+(1/4)-4.25)×5/8】÷(3/8)
三道可以巧算的题,急1,3/5×3/8+3/8×3/11+3/11×3/14+3/142,3/4+3/(4×7)+3/(7×10)+3/(10×13)3,1/3+1/(3×5)+1/( 5×7)+1/(7×9)+1/(9×11)
1/(1×3)+1/(3×5)+1/(5×7)+……+1/(17×19)=?
1.75-1/3+4/5+1.05-2/3+2.2
五年级数学简算(1+2/1+3/1+4/1)×(2/1+3/1+4/1+5/1)-(1+2/1+3/1+4/1+5/1)×(2/1+3/1+4/1)1*3*5+3*5*7+5*7*9+……101*103*105
2分之5+2分之5+1+(-2分之3)=()