口算：75+25= 808﹣108= 35÷5= 730﹣230=72÷8= 570+100= 42÷8= 8×7=49+21= 130+30=
看谁算得巧． ①75.5﹣8.25﹣12.75②÷[×（0.5+）]③43﹣43×0.9④÷﹣×6．
73.66++26.34++．
用自己喜欢的方法计算下面各题． 57.5﹣4.25﹣15.75（+）×8+4.5﹣（+1.5）﹣ 125×32×16.31﹣2.31÷（+×）÷．
下列各题能简算的要简算． 3.1+2.4+1.9+3.6300﹣288÷2448×（+）0.46×98+0.92×÷×21÷（+）÷．
计算下面各题，能用简便方法算的要简算． 24.56﹣﹣4.56﹣4.754.2×5.43+4.57×4.2 6035﹣450÷30×15÷[÷（﹣）]．
÷[
×（0.5+
）]③43﹣43×0.9④
÷
﹣
×6．
+26.34+
+
．
+
）×8+
4.5﹣（
+1.5）﹣
×16.31﹣2.31÷
（
×
）÷
．
+
）0.46×98+0.92
×
÷
+
．
﹣4.56﹣4.754.2×5.43+4.57×4.2
÷[
÷（
﹣
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