口算.0.5×0.9= 0.8+0.6×2= 2.3×2+3=100×0.053+0.47= 4.5×2+1.5= 3.6×3×0.2=0.8﹣0.8×1= 2.8×4﹣2.2=
计算：12345×2345+2469×38275= ．
10﹣1.2+5﹣3.4+3﹣5.6+2﹣7.8= ．
1997×0.71+11×+2222×0.29= ．
计算15.38﹣3.99+6.72﹣9.01= ．
13+86×0.25+0.625×86+86×0.125= ．
+2222×0.29= ．
+86
×0.25+0.625×86
+86
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