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3.14x36

竖式 3. 1 4 x 3 6 ______________ 1 8 8 4 9 4 2 ———————— 1 1 3. 0 4

利用乘法分配律简便计算 31.4x2.2+3.14x36+314x0.42 =3.14x22+3.14x36+3.14x42 =3.14x(22+36+42) =3.14x100 =314

56.52

-3.14x35.2+6.28x(-23.3)-1.57x36.4 =-3.14x35.2+3.14x(-46.6)-3.14x18.2 =-3.14x(35.2+46.6+18.2) =-3.14x100 =-314

(一3.14)x35.2十6.28x(一23.3)一1.57x36.4 =(一3.14)x35.2十3.14*2x(一23.3)一1.57*2/2*36.4 =-3.14[35.2+2*23.3+36.4/2] =-3.14[35.2+2*23.3+18.2] =-3.14[35+0.2+46+0.6+18+0.2] =-3.14[35+46+18+0.2+0.6+0.2] =-3.14[35+46+18+1] =-3.14[36+4...

720/(2x3.14x0.36)=318.3≈318(圈)

提取公因数3.14,则原式变为 3.14X[-35.2+2X(-23.3)-0.5X36.4] =3.14X[-35.2-46.6-18.2] =3.14X(-100) =-314

花坛半径:12÷2=6(米)小路面积:3.14x7x7-3.14x6x6=3.14x49-3.14x36=3.14x(49-36)=3.14x13=40.82(平方米) wdxf444... 推荐于:2017-10-02 4 7 ...

-3.14x35.2+6.28x(-23.3)-1.57x36.4 =-3.14x35.2+3.14x(-46.6)-3.14x18.2 =-3.14x(35.2+46.6+18.2) =-3.14x100 =-314

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