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1.2x2.5+0.8x2.5用简便运算和梯等式怎么算

原式=(1.2+0.8)×2.5 =2×2.5 =5

递等式计算 1.2x2.5+0.8x2.5 =2.5x(1.2+0.8) =2.5x2 =5 10.25÷2.5÷4 =4.1÷4 =1.025

1.25x0.7x0.8 =1.25x0.8x0.7 =1x0.7 =0.7

0.8×(1.25+0.125) =0.8×1.25+0.8×0.125 =1+0.1 =1.1

1、3.125×0.4×0.8×0.25 =(3.125×0.8)×(0.4×0.25) =2.5×0.1 =0.25 2、(0.8×1.2+0.8×0.05)×3.4 =0.8×(1.2+0.05)×3.4 =0.8×1.25×3.4 =1×3.4 =3.4 3、72÷2.5 =(72×4)÷(2.5×4) =288÷10 =28.8 4、111.1÷1.11×3.33 =111.1×(3.33÷1.11) =...

(10-6.35×0.8)×0.5 =10X0.5-6.35X0.8X0.5 =5-6.35X0.4 =5-2.54 =2.46

1.25x8+1.25x0.8

(1)1.5×105=1.5×(100+5)=1.5×100+1.5×5=157.5;(2)2.33×0.5×4=2.33×(0.5×4)=2.33×2=4.66;(3)24.6+18.7+15.4=24.6+15.4+18.7=40+18.7=58.7;(4)1.2×2.5+0.8×2.5=2.5×(1.2+0.8)=2.5×2=5;(5)2.05÷0.82+33.6=2.5+33.6=36.1;(6...

1/6 4/6 9/6 16/6 25/6 分母不变6 分子为1平方,2平方.... 133/57 119/51 91/39 49/21 28/12 7/3 第二个有点乱 是不是你写错了

68.8÷(1.25×8) =68.8÷10 =6.88 0.68×(6.2-5.2) =0.68×1 =0.68

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