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=$A$2+$A$3 =A2+A3 =A:2+A:3 =SUM(A2:A3)
=(SUM)A1:A5 =SUM(A2,B3;B7) =SUM A1:A5 =SUM(A10,B5:B10,28)
①直接开平方法,②配方法,③公式法,④因式分解法 ①直接开平方法,②公式法,③、④因式分解法 ①因式分解法,②公式法,③配方法,④因式分解法 ①直接开平方法,②、③公式法,④因式分解法
3a(a-b)-5b(a-b)=(a-b)(3a-5b) 4x2-y2=(2x-y)(2x+y) -4x2+12xy-9y2=-(2x-3y)2 x4-8x2y2+16y4=(x2-4y2)2
=SUM(A2:A5) =SUMIF(A2:A5,800,B2:B5) =COUNTIF(A2:A5,800) =SUM(B2:B5,800,A2:A5)
=(sum)A1、A5 =sum(A2,B3,B7) =sumAl、A5 =sum(A10,B5、B10、28)
=SUM(A1:B5 B1:C5) =SUM(B1,B2,…,B5) =SUM(B1+B2,B3+B4,B5) =SUM(B1,B2,B3,84,B5)
(b﹣2)(a+a2) (b﹣2)(a﹣a2) a(b﹣2)(a+1) a(b﹣2)(a﹣1)
=(sum)A1:A5 =sum(A2,B3,B7) =sumA1:A5 =sum(A10,B5:B10:28)
a(4﹣a2) a(2﹣a)(2+a) a(a﹣2)(a+2) a(2﹣a)2
LETA4:B5=D4:E5 A4=D4,B5=E5 A4:B5=D4:E5 LET&A4:B5=D4:E5
=(sum) A1:A5 =sum(A2, B3, B7) =sum A1:A5 =sum(A10, B5:B10: 28)