(+1)*(+2)*...*(+202)*(+203)*(-1/203)*(-1/202)*...*(-1/2)*(-1)
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(+1)*(+2)*...*(+202)*(+203)*(-1/203)*(-1/202)*...*(-1/2)*(-1)
(+1)*(+2)*...*(+202)*(+203)*(-1/203)*(-1/202)*...*(-1/2)*(-1)
(+1)*(+2)*...*(+202)*(+203)*(-1/203)*(-1/202)*...*(-1/2)*(-1)
(+1)*(+2)*...*(+202)*(+203)*(-1/203)*(-1/202)*...*(-1/2)*(-1)
= (+1)*(-1)*(+2)*(-1/2)*...*(+202)*(-1/202)*(+203)*(-1/203) 【乘法交换律】
= [(+1)*(-1)]*[(+2)*(-1/2)]*...*[(+202)*(-1/202)]*[(+203)*(-1/203)] 【乘法结合律】
= (-1)*(-1)*...*(-1)*(-1) 【共203个(-1)】
= -1
每个数都能找到他相反数的倒数,乘积为-1,203个-1相乘=-1
-1
1+2+3.+202+203+204
101^2-202+1=?快
(+1)*(+2)*...*(+202)*(+203)*(-1/203)*(-1/202)*...*(-1/2)*(-1)
计算:198^2-396×202+202^2
计算(2/3)^200×(-3)^201×(-1/2)^202
用乘法公式计算:(1) 2 2 535 x4-465 x4 (2) 2 2 202+202x196+98
203-202+201-200+199-198+ ...+3-2+1等于
199又1/2×98+202×199.5等于多少
800除以(202除以2-1)=x
101²-202+1
简便计算202^2
利用因式分解计算(1)2015²-2013² (2)202²+202×196+98²
用简便方法计算.(1)3.66平方-4*1.33平方 (2)202平方+202*196+98平方
用简便方法计算:1)202²+202×196+98² 2)999²—1002×998
(+1)*(+2)*…*(+202)*(+203)*(-1/203)*(-1/202)**(-1/2)*(-1)=?
计算:(-1)∧202×(2/3)∧2÷(-2)∧3-1
利用因式分解计算:202^2+202*196+98^2
利用因式分解计算:202^2+202×196+98^2