(1)原式=(68.3+31.7)*(68.3-31.7)=100*36.6=3660
(2)原式=(99*8+3)*(100*8+5)/64=9999.61
(3)原式=8.748-1.728=7.02
(4)原式=40401-2704+215303=253000
(1)原式=(68.3+31.7)*(68.3-31.7)=100*36.6=3660
(2)原式=(99*8+3)*(100*8+5)/64=9999.61
(3)原式=8.748-1.728=7.02
(4)原式=40401-2704+215303=253000