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%3.14x32.2+6.28x(",1)用简便方法算

-3.14x32.2+6.28x(-22.1) =-3.14x(32.2+44.2) =-3.14x66.4 =-(188.4+18.84+1.256) =-(200-11.6+20-1.16+1.256) =-(221.256-12.76) =-(201.256+8.24) =-209.496

原式=-3.14×35.2+3.14×(-46.6)-3.14×18.2=-3.14(35.2+46.6+18.2)=-3.14×100=-314.故答案是:-314.

-3.14*35.2+6.28*(-23.3)-1.57*36.4 =-(3.14*35.2+6.28*23.3+1.57*36.4) =-[3.14*35.2+3.14*2*23.3+(3.14/2)*36.4] =-3.14*(35.2+46.6+18.2) =-3.14*100 =-314 也可以提1.57为公因子,一样的.

原式 = 3.14*35.2 + 3.14*(-46.6)-3.14*18.2 =3.14*(35.2-46.6-18.2) =3.14*(-29.6) = -92.944 。

3.14 ×35.2+6.28×23.2+15.7×36.4的简便算法 3.14 ×35.2+6.28×23.2+15.7×36.4 =3.14 ×35.2+3.14×46.4+3.14×36.4x5 =3.14 ×35.2+3.14×46.4+3.14×182 =3.14 ×(35.2+46.4+182) =3.14 ×263.6 =827.704

-3.14*32.2+6.28*(-24.3)-1.57*38.4 =-3.14×32.2-3.14×48.6-3.14×19.2 =-3.14×(32.2+48.6+19.2) =-3.14×100 =-314

-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

6.28*(-23.3)-3.14*35.2-1.57*36.4 =6.28*(-23.3-17.6-9.1) =6.28*(-50) =314;

3.14×45.2-6.28×20.8+1.57×92.8 =3.14×45.2-3.14×41.6+3.14×46.4 =3.14×(45.2-41.6+46.4) =3.14×50 =157

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