递等式计算，能简算的要简算：
9.7﹣22.78÷3.4 1.05÷0.7+18.9 0.4×5÷0.4×5
21÷0.25÷0.4 0.125×32×0.25 82.2×9.9．
递等式计算，能简算的要简算：
9.7﹣22.78÷3.4 1.05÷0.7+18.9 0.4×5÷0.4×5
21÷0.25÷0.4 0.125×32×0.25 82.2×9.9．
÷
表示
= 7×
=
=
×6÷
=
×
=
×16=
÷2=（
）×16=．
=
=
= 902=
= 8：10=
=
×12=
=
=
=
÷7= 1÷
= 12÷
=
+3÷
=
÷3= 6×
=
+
= 30÷
=
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