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2.5*3/4+7.5*0.75简便运算

2.5+7.5*4*16 =2.5+30*16 =482.5

原式=2.7*7.5+7.2*7.5+0.1*7.5=(2.7+7.2+0.1)*7.5=10*7.5=75

(¾)³×(¾)²

先2.5×4,在×3.79

0.75化成 分数为3/4 原式=3/4+3/4x 5/8-3/8x3/4 (提取公因式3/4) =3/4(1+5/8-3/8) (将括号内的进行加减计算) =3/4x4/5 (约分) =3/5

一。3.4-0.15x2.6 =3.14-0.39 =-2.75 二。(6.05-3.35)÷1.5x0.9 =2.7/1.5*0.9 =1.8*0.9 =1.62 三。(19.75-6.38)÷0.25 =13.37*4 =53.48 四。0.4x[1.4-(2.4-2.25)] =0.4*(1.4-2.4+2.25) =0.4*(-1+2.25) =0.4*1.25 =0.5 简便运算 一。3.4-0.1...

4/3*5/1+4/3*5/2+0.75*5/3-4/3 =4/3*5/1+4/3*5/2+4/3*5/3-4/3*1 =4/3(5/1+5/2+5/3-1) =4/3 *5/1 =20/3 问一下,你是不是把分数写反了,我是按你写反的答的题,答案是二十分之三

4/11*3.3*2.5 =4/11*1.1*7.5 =4/10*7.5 =30/10 =3

(4.36 + 3.64 + 2) * 2.5 = 10 * 2.5 = 25 1+ 2/7 + 7/9 - 2/7 + 2/9 = 2 (5/7 - 1/2) / (10/21 - 3/10) = ((5*30)/(7*30) - 105/(2 * 105))/((10 * 10)/(21*10) - (3*21)/(10*21))=(5*30-105)/(10*10-3*21)=(150 - 105)/(100 - 63) = 45/27 = 5...

7.5=2.5×3 22.5=2.5×9 所以就变成 2.5×(3×2.3+1.9+9×0.4)=2.5×(6.9+1.9+3.6)=25×12.4=31

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