Question

(一3,14)x35,2十6,28x(一23,3)一1,57x36,4利用简便法如何计算

(一3,14)x35,2十6,28x(一23,3)一1,57x36,4利用简便法如何计算

Answer 1

(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+46+18]
=-3.14[30+6+40+6+20-2]
=-3.14[30+40+20+6+6-2]
=-3.14[90+10]
=-3.14*100
=-314

Answer 2

-3.14x35.2+3.14x(-46.6)-3.14x18.2
=3.14x(-35.2-46.6-18.2)
=3.14x(-100)
=-314