Mathematics
Junior High
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口(5) (99×275+ 273) + 275×85- (99× 275 +278) 275× 35
よって、
P18
(2) 2002
(3) 8
与式==
(4) -3
(5) 4999
解説
(1) 1998 =r とおくと,
与式=-(r-1) (r+1)=1
3(1) 8
(2) 1995 =x とおくと,
解説
与式= (r-2)?- (エ-1)r+(r+3) (r+1)-
=x+7
(2) d+
(3) 与式= (10.2+9.8) (10.2-9.8) =D 20×0.4=8
(4) 与式=18.6+31-26.04 +31-85.56=31
1
a
= (18.6- 26.04-85.56) + 31
1
= - 93+31= -3
(5) 275=x とおくと,
与式= (99.r +-2) +x×85-(99r+r+3)
4(1)7
解説
-x×35
(-(100-2) ×85-(100+
3
×85-(100 +
×35
)-
170
= 8500 -
- 3500-
105
=5000
275
=275 をもどすと, この式は 5000-1=D4999
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