123²-124×122运用简便方法计算初二数学题

jing1sh2022-10-04 11:39:541条回答

已提交,审核后显示!提交回复

共1条回复
售票员2 共回答了15个问题 | 采纳率80%
=123²-(123+1)×(123-1)
=123²-(123²-1²)
=123²-123²+1
=1
1年前

相关推荐

新概念英语第一册123-124选择题
新概念英语第一册123-124选择题
( )1.Let him ____________.
A.to go home B.goes home
C.go home D.went home
( )2.This is the ship ________ we travelled ________ .
A.that ; on B.which ; at C.that ; at D.who ; on
( )3.________ fine weather
A.What B.How C.What a D.How a
( )4.Yesterday he shaved _____ his beard .
A.of B.off C.out D.in
( )5.This is a photo ______ I took during this trip ________ America .
A.which ; in B.that ; to C./ ; in D.whom ; to
( )6.He _______ a beard during his trip last year .
A.grew B.grow C.grows D.growing
( )7.He invited me ________ his house last year .
A.for B.to C.in D.at
( )8.This is the person _______ spoke to me just now.
A.which B.whom C.who D.what
( )9.This is the film ______ he told me about .
A.which B.whom C.who D.what
( )10.The woman _______ standing outside is my aunt .
A.whom is B.that C.whom D.who is
danielyuo1年前1
海阔天空1979 共回答了18个问题 | 采纳率88.9%
C.A.A.B.B.A.B.C.A.D