Question

1.23×2.45-1.22×2.46用简便运算怎么算？

1.4ⅹ2.45=

Answer 1

1.23x2.45-1.22x2.46
=（1.22+0.01）x2.45-1.22x2.46
=1.22x2.45+0.01x2.45-1.22x2.46
=1.22x(2.45-2.46)+0.0245
=1.22x(-0.01)+0.0245
=0.0245-0.0122
=0.0123

Answer 2

1.23×2.45－1.22×2.46=（1.22+0.01）×2.45－1.22×（2.45+0.01）=1.22×2.45+0.01×2.45－1.22×2.45－1.22×0.01=0.01×（2.45－1.22）=0.01×1.23=0.0123

Answer 3

1.23×2.45—1.22×2.46
=1.23×2.45—1.22×2.45
—1.22×0.01
=2.45×（1.23—1.22）
—0.0122
=2.45×0.01一0.0122
=0.0245—0.0122
=0.0123

Answer 4

1.23×2.45-1.22×2.46
＝（1.22+0.01）×2.45-1.22×2.46
＝1.22×2.45+0.01×2.45-1.22×2.46
=1.22×（2.45-2.46）+0.0245
=1.22×（-0.01）+0.0245
=0.0123

Answer 5

1.23X2.45一1.22x2.46
二3.0135一1.22x2.46
二3.0135一3.0012
I二0.0123