(1+123+234)×(123+234+345)-(1+123+234+345)×(123+234)
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(1+123+234)×(123+234+345)-(1+123+234+345)×(123+234)(1+123+234)×(123+234+345)-(1+123+234+345)×(123+23
(1+123+234)×(123+234+345)-(1+123+234+345)×(123+234)
(1+123+234)×(123+234+345)-(1+123+234+345)×(123+234)
(1+123+234)×(123+234+345)-(1+123+234+345)×(123+234)
设123+234为a,
则原式=(1+a)(345+a)-(346+a)a
=345+a+345a+a平方-346a-a平方
=345
(1+123+234)×(123+234+345)-(1+123+234+345)×(123+234)
(1000+123+234)×(123+234+345)-(1000+123+234+345)×(123+234)简便运算
计算 123 +234 +345 …………+282930
计算:123 +234 +345 …………+282930
123×123+123
123+1+123=?
(2+23+234)×(23+234+2345)-(2+23+234+2345)×(23+234)等于多少,
还要有算式,最好有详细说明.62×34+38×20+38×14〔4125×(1+2+3+……+100)〕÷〔33*(1+2+3……+100)〕(234+234+234+234+234+234)/(18+18+18+18+18+18)(100个459)/(100个51)
简便计算 123+123+123+456
123+123等于 多少
123+234=?
123?234?456?
123+456等于
求123×123×…×123(有123个123相乘)+234×234×…求123×123×…×123(有123个123相乘)+234×234×…×234(有234个234相乘)+568×568×…×568(有568个568相乘)被3除的余数.
简便计算:234×12600+76600×126
234×12600+76600×126简便计算
请问234+123等于几?
123+234+345+456=?