www.qprq.net > 99.99*0.8.11*2.8谁能帮我解决简便算法,要过程...

99.99*0.8.11*2.8谁能帮我解决简便算法,要过程...

99·99分成9个11.11

99.99*0.8+11.11*2.8 =11.11*(9*0.8)+11.11*2.8 =11.11*7.2+11.11*2.8 =11.11*(7.2+2.8) =11.11*10 =111.1

99.99*0.8+11.11*2.8 =(100-0.01)*0.8+11.11*(3-0.2) =100*0.8-0.01×0.8+11.11*3-11.11*0.2 =80-0.008+33.33-2.222 =111.1

11.11(9x0.8十1x2.8) =11.11(7.2十2.8) =11.11X10 =111.1

(1)3.74×2.85+8.15×3.74-3.74=3.74×(2.85+8.15-1)=3.74×10=37.4;(2)99.99×0.8+11.11×2.8=11.11×7.2+11.11×2.8=11.11×(7.2+2.8)=11.11×10=111.1;(3)31.4×0.68+314×0.032=314×0.068+314×0.032=314×(0.068+0.032)=314×0.1=31.4;(4...

15.7减0.7乘2.8简算 =15.7-0.7x(3-0.2) =15.7-0.7x3+0.7x0.2 =15.7-2.1+0.14 =13.6+0.14 =13.74

原式=2.8×23.4+11.1×8×7.2+65.4×2.8 =2.8×(23.4+65.4)+88.8×7.2 =2.8×88.8+7.2×88.8 =88.8×(2.8+7.2) =88.8×10 =888

①2.5x2.8X4 乘法交换律+乘法结合律 =2.5x4x2.8 =10x2.8 =28 ②4.8X3.6一3.8X3.6 乘法分配律 =3.6x(4.8-3.8) =3.6x1 =3.6 ③(8十0.8)×1.25 乘法分配律 =8x1.25+0.8x1.25 =10+0.1 =10.1 ④7.09X99+7.09 乘法分配律 =7.09x(99+1) =7.09x100 =709

不知道你是不是问了三个方程。 如果是,这是我的答案:

6x=24 x=24÷6 x=4 4.5x=90 x=90÷4.5 x=20 0.8x=9.6 x=9.6÷0.8 x=12 x÷3=12 x=12*3 x=36 y÷2.8=11 y=11*2.8 y=30.8

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