递等式计算，能简算的要简算0.11×1.8+8.2×0.11 0.8×（3.2﹣2.99÷2.3） （8.1﹣5.4）÷3.6+85.7．
口算×6=+=×=×6=÷=÷= 1﹣=﹣=×4=÷=
直接写得数．×= 0×=÷=÷4= 12÷= 0.3×=×÷×= 0×+=
直接写出得数 21×=÷2=×=÷=÷= 12÷= 1÷=×0=
直接写得数． 20×=÷=×=÷6=×12=×=
直接写得数．×=﹣=×=×=÷=÷=÷=÷=
×6=
+
=
×
=
×6=
÷
=
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= 1﹣
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﹣
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×4=
÷
=
×
= 0×
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÷4= 12÷
= 0.3×
=
×
÷
×
= 0×
+
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÷2=
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÷
=
÷
= 12÷
= 1÷
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×0=
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=
×
=
÷6=
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×
﹣
=
×
=
×
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÷
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