(1)原式=4.25×4×5.24/4＋1.52/4×4×2.25=17×1.31+0.38×9=20×1.31-3.93+0.38×10-0.38=26.2+3.8-4.31=30-4.31=25.69(2)原式共有998+1项,在前998项中,1-3=-2,5-7=-2……1993-1995=-2,这样差为-2的组有499组故原式=-2×499+1997=1997-2×50

Question

(1)原式=4.25×4×5.24/4＋1.52/4×4×2.25
=17×1.31+0.38×9
=20×1.31-3.93+0.38×10-0.38
=26.2+3.8-4.31
=30-4.31
=25.69
(2)原式共有998+1项,在前998项中,
1-3=-2,5-7=-2……1993-1995=-2,这样差为-2的组有499组
故原式=-2×499+1997
=1997-2×500+2
=999
(3)原式=5.6×69.32+138.64/2×0.05×2＋69.32×10×0.43
=5.6×69.32+69.32×0.1＋69.32×4.3
=69.32×(5.6+0.1+4.3)
=69.32×10
=693.2
(4)原式=0.37×100×6×4×0.25＋3×(8.75＋28.25)
=37×6+37×3=37×9=37×10-37
=333

Answer 1

原式都是什么呀?