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1.72X1.4÷1.72X1.4(简便算法)

1.72X1.4÷1.72X1.4 =1.72÷1.72X1.4X1.4 =1X1.4X1.4 =1.96

=1.7*1+1.7*2+1.25 =1.7*3+1.25 =5.1+1.25 =6.35 求采纳,我有过程

原式=(12.6÷1.4)×(7.6÷1.9)×(2.32÷2.9) =9×4×0.8 =36×0.8 =28.8 望采纳,谢谢

原式 =(12.6÷1.4)x(7.6÷1.9)x(2.32÷2.9) =9x4x0.8 =36x0.8 =28.8 供参考。

=12.6/1.4*(7.6/1.9)*(2.32/2.9) =9*4*0.8 =36*0.8 =144/5=28.8

7.2÷(x-1.4)=1.2 解:x-1.4=7.2÷1.2 x-1.4=6 x=6+1.4 x=7.4

12.6x7.6x2.32➗1.9➗1.4➗2.9如何用简便计算? 12.6x7.6x2.32➗1.9➗1.4➗2.9 =(12.6÷4)*(7.6÷1.9)*(2.32÷2.9) =3.15*4*0.8 =10.08

(1)6.9x-4.1=9.7, 6.9x-4.1+4.1=9.7+4.1, 6.9x÷6.9=13.8÷6.9, x=2;(2)2(x+1.7)=9.2, 2(x+1.7)÷2=9.2÷2, x+1.7-1.7=4.6-1.7, x=2.9;(3)4.5x+2=15.5, 4.5x=2-2=15.5-2, 4.5x÷4.5=13.5÷4.5, x=3;(4)9x-5x=0.64, 4x=0.64,...

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