(1)4
=4
=(4
=5
=3
(2)9999×36+6666×96, =3333×3×36+3333×2×96, =3333×108+3333×192, =3333×(108+192), =3333×300, =999900; (3)12
=12
=
=
(4)3.14×3.2+5.8×3.14+3.14, =3.14×(3.2+5.8+1), =3.14×10, =31.4; (5)783×
=783×0.375-0.375+218×0.375, =(783-1+218)×0.375, =1000×0.375, =375; (6)1+2-3-4+5+6-7-8+…-1983-1984+1985+1986, =1+(2-3-4+5)+(6-7-8+9)…+(1982-1983-1984+1985)+1986, =1+0+0…+1986, =1987. |