a. `306xx 18-306 xx 8=306 xx (18-8) =306 xx 10=3060`
b. `9 xx 9+25xx9 +33 xx18`
`=9 xx9 + 25 xx 9 + 33 xx 2 xx 9`
`=9x (9+25+33xx2)`
`=9 xx (9+25+66)`
`=9 xx 100`
`=900`
a) \(306\cdot18-306\cdot8=306\cdot10=3060\)
b) \(9\cdot9+25\cdot9\cdot33\cdot18=9\cdot9\cdot\left(1+25\cdot33\cdot2\right)=81\cdot1651=133731\)
a. 306×18−306×8=306×(18−8)=306×10=3060306×18-306×8=306×(18-8)=306×10=3060
b. 9×9+25×9+33×189×9+25×9+33×18
=9×9+25×9+33×2×9=9×9+25×9+33×2×9
=9x(9+25+33×2)=9x(9+25+33×2)
=9×(9+25+66)=9×(9+25+66)
=9×100=9×100
=900
a. 306×18−306×8=306×(18−8)=306×10=3060306×18-306×8=306×(18-8)=306×10=3060
b. 9×9+25×9+33×189×9+25×9+33×18
=9×9+25×9+33×2×9=9×9+25×9+33×2×9
=9x(9+25+33×2)=9x(9+25+33×2)
=9×(9+25+66)=9×(9+25+66)
=9×100=9×100
=900
