口算．
35.7+14.8= 24.8﹣14.5= 17﹣14.5= 287+138= 657﹣154=
3.65×10= 9.05÷10= 30﹣19.2= 25÷10﹣25÷10= 4.2﹣4.2×0=
34.5×10+55= 0÷25+2.5= 8.65﹣2.3﹣1.65= 0.01×100+100=
口算．
35.7+14.8= 24.8﹣14.5= 17﹣14.5= 287+138= 657﹣154=
3.65×10= 9.05÷10= 30﹣19.2= 25÷10﹣25÷10= 4.2﹣4.2×0=
34.5×10+55= 0÷25+2.5= 8.65﹣2.3﹣1.65= 0.01×100+100=
+
+
=
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=
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+
= 7.5﹣（2.5+3.8）=
+
= 0.36+1.54= 135÷5= 2﹣
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=
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= 1﹣
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=（
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+
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+
= 1﹣
=
+
=
﹣
=
+
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= 5÷8= 9.2×0.25×4= 0.8×25﹣10=
．
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