脱式计算（能简算的要简算）
12.03﹣22.78÷3.4 4.78×99+4.78 2.5×6.9×4
28.8÷1.2×0.6 6.8+3.2÷2.5 8.6×3.3+2.7×8.6．
脱式计算（能简算的要简算）
12.03﹣22.78÷3.4 4.78×99+4.78 2.5×6.9×4
28.8÷1.2×0.6 6.8+3.2÷2.5 8.6×3.3+2.7×8.6．
=
=
=
×14=
=
×
= 20×
=
×
=
×
=
×
×
=
×
=
×（1﹣
）=
×84
×
（
+
）×36（
+
）×9．
．
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