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2/51×35分之4×7/4等于多少用分数表示

2/51×4/35×7/4 =2/51x1/5 =2/255

51又3分之2×5分之2-7分之4 =(51+2/3)x2/5-4/7 =(50+1+2/3)x2/5-4/7 =20+2/5+4/15-4/7 =20+6/15+4/15-4/7 =20+2/3-4/7 =20+14/21-12/21 =20+2/21 =420/21+2/21 =422/21

51×3/34 =(3×17×3)/(2×17) =9/2

解:依据题意有, (4/3)*(2/51)*(17/80) =(4/3)*(1/120) =(1/3)*(1/30) 1/90 答:3分之4乘51分之2乘80分之17等于1/90.

51又3分之2÷3分之5+71又4分之3÷4分之7+91又5分之4÷5分之9 =(50+3分之5)÷3分之5+(70+4分之7)÷4分之7+(90+5分之4)÷5分之9 =50÷3分之5+3分之5÷3分之5+70÷4分之7+4分之7÷4分之7+90÷5分之9+5分之4÷5分之9 =30+1+40+1+50+1 =123

如图

51又2/3÷5/3+71又3/4÷7/4+91又4/5÷9/5 =(50+5/3)×3/5+(70+7/4)×4/7+(90+9/5)×5/9 =50×3/5+5/3×3/4+70×4/7+7/4×4/7+90×5/9+9/5×5/9 =30+1+40+1+50+1 =123

数学题简便计算 51又2/3÷1又2/3+71又3/4÷1又3/4 =(50+5/3)×3/5+(70+7/4)×4/7 =50×3/5+5/3×3/5+70×4/7+7/4×4/7 =30+1+40+1 =72

2×括号3/34+51分之二括号乘以17 2×(3/34+2/51)x17 =2x17x3/34+2x17x2/51 =3+4/3 =4又1/3

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