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2.5x1.7x4= 3.2x1.9+1.9x6.8= (8+0.8)x1.25

2.5x1.7x4 =2.5×4×1.7 =10×1.7 =17 3.2x1.9+1.9x6.8 =1.9×(3.2+6.8) =19 (8+0.8)x1.25 =8×1.25+0.8×1.25 =10+1 =11

1.2x2.5+0.8x2.5 =(1.2+0.8)x2.5 =2x2.5 =5

2.5x4+2.5x0.8 =10+2.5x0.4x2 =10+1x2 =10+2 =12 1.5+8.5x6.8 =1.5+57.8 =59.3 0.88x1.25 =(0.8+0.08)x1.25 =0.8x1.25+0.08x1.25 =1+0.1 =1.1

=0.8x1.13x1.25x4 =(0.8x1.25)x(1.13x4) =1x4.52 =4.52

2.5x32x1.25、 =(2.5×4)×(8×1.25) =10×10 =100 5.5x1.7十8.3x5.5、 =5.5×(1.7+8.3) =5.5×10 =55 0.45x202、 =0.45×(200+2) =0.45×200+0.45×2 =90+0.9 =90.9 10.01x101一10.01、 =10.01x(101-1) =10.01x100 =1001 1.4x99、 =1.4×(100-...

第二题不全哇~ 检验的时候,将算出来的数,带入方程左边即可。 不懂请追问。

4乘3.67加6.1乘3.67减0.367 =4×3.67+6.1×3.67-0.1×3.67 =(4+6.1-0.1)×3.67 =10×3.67 =36.7 (9.8+9.8+9.8+9.8)x2.5 =9.8×4×2.5 =9.8×(4×2.5) =9.8×10 =98 1.25x3.2x4.5 =(1.25×0.8)×(4×4.5) =1×18 =18

0.8x1.9+0.8x0.6 =0.8x(1.9+0.6) =0.8x2.5 =2

1、0.4x(2.5-0.25)+2.9 =2.5*0.4-0.4*0.25+2.9 =1-0.1+2.9 =3.9-0.1 =3.8 2、1.25-1.25x0.8 =1.25*(1-0.8) =1.25*0.2 =0.25 3、11.25+11.25x0.8 =11.25*2-11.25*0.2 =22.5-2.25 =20.25 4、(0.25+2.5+25)x0.8 =(0.25+2.5+25)-(0.25+2.5+25...

世界上有鬼的证据 (1)在美国科学家们做过一个实验。 他们找来一个人,将他催眠,他竟能说出自己的前生的情况和今生死时的模样 (2)我的一个朋友就这么不幸死去。 她有一次在家无聊地用自己家电话拨通自己家电话,很多次后终于拨通了,她听到...

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