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0.45x7.5%0.45x6.5的简便计算

0.45x7.5-0.45x6.5 =0.45x(7.5-6.5) =0.45x1 =0.45

0.45×7.5-0.35×6.5 =0.45×(1+6.5)-0.35×6.5 =0.45×1+0.45×6.5-0.35×6.5 =0.45+(0.45-0.35)×6.5 =0.45+0.1×6.5 =0.45+0.65 =1.1

3.8x0.45+0.38x6.5-0.038x10简便算法 =3.8x(0.45+0.65-0.1) =3.8x1 =3.8

3.8×0.45+0.38×6.5-0.038×10 =3.8×0.45+3.8×0.65-3.8×0.1 =3.8×(0.45+0.65-0.1) =3.8×1 =3.8 定律: 乘法分配律: 简便计算中最常用的方法是 乘法分配律。乘法分配律指的是ax(b+c)=axb+axc其中a,b,c是任意实数。相反的,axb+axc=ax(b+c)叫做乘...

0.26x5.5十2.6x0.45 =0.26x5.5十0.26x4.5 =0.26×(5.5+4.5) =0.26×10 =2.6 或 0.26x5.5十2.6x0.45 =2.6×0.55+2.6×0.45 =2.6×(5.5+4.5) =2.6×1 =2.6

4.5*0.75-0.45*6.5用检便方法计算 4.5*0.75-0.45*6.5 =4.5x0.75-4.5x0.65 =4.5x0.1 =0.45

0.45÷0.6÷0.5 =0.45÷(0.6×0.5) =0.45÷0.3 =1.5

(1)0.64x9.9 =0.64x(10-0.1) =0.64x10-0.64x0.1 =6.4-0.064 =6.336 (2)3.14x99+3.14 =3.14x(99+1) =3.14x100 =314 (3)0.45x7.5-0.45x6.5 =0.45x(7.5-6.5) =0.45x1 =0.45 (4)0.25x3.5x4x2 =(0.25x4)x(3.5x2) =1x7 =7

4.5x0.75-0.45x6.5 =4.5x(0.75-0.1x6.5) =4.5x(0.75-0.65) =4.5x0.1 =0.45 谢谢 ,请采纳

0.45x-4.5×6=45 0.45x-27=45 0.45x=45+27 0.45x=72 x=160 望采纳,谢谢!!!

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