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18乘0.45,脱式计算

=18x(5-0·5)=18x5-18x0·5=90-9=81

180÷45 =180÷(9×5) =180÷9÷5 =20÷5 =4

120÷[(35-27)×5] =120÷(8×5) =120÷40 =3 (180+120×6)÷45 =(180+720)÷45 =900÷45 =20 69×6÷(30-12) =69×6÷18 =414÷18 =23 [175-(49+21)]×15 =(175-70)×15 =105×15 1575

(1)180-(325-900÷5)=180-(325-180)=180-145=35;(2)45×[(470-150)÷40]=45×[320÷40]=45×8=360;(3)25×66×4=25×4×66=100×66=6600;(4)101×93=(100+1)×93=100×93+1×93=9300+93=9393;(5)12.3-2.47-3.53=12.3-(2.47+3.53)=12.3-...

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