作业帮2.34x9.9+0.234
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2.34x9.9+0.234
2.34x9.9+0.234
2.34x9.9+0.234
2.34x9.9+0.234
=2.34x9.9+2.34x0.1
=2.34x(9.9+0.1)
=2.34x10
=23.4
2.34x9.9+0.234
=2.34x(9.9+0.1)
=2.34x10
=23.4
=0.234x99+0.234x1=0.234x（1+99）=23.4
2.34x9.9+0.234=23.4
=0.234X99+0.234=0.234X100=23.4
2.34x9.9+0.234
9x9
3.228x(-9)+(-3.272)x9-(-1.5)x9
9+9x9= ( )+( )x9=900000 18+98x9= （ ）+（ ）x9=9000000 117+987x9= ( )+( )x9=90000000找规律
0.8x33x1.257.2x9.9
19+9 X9=100 118+98X9=1000 117+987X9=10000 116+98719+9 X9=100118+98X9=1000117+987X9=10000116+9873X9=100000有什么规律在写两组
19=1x9+(1+9) 29=2x9+(2+9) 39=3x9+(3+9) 1289=?
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