92*0.9 7.2简便运算
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92*0.9 7.2简便运算
92*0.9 7.2简便运算
92*0.9 7.2简便运算
=92×0.9+9.2-2
=9.2×9+9.2-2
=9.2×(9+1)-2
=9.2×10-2
=92-2
=90
92*0.9 7.2简便运算
92*0.9 7.2简便运算
92*0.9 7.2简便运算
=92×0.9+9.2-2
=9.2×9+9.2-2
=9.2×(9+1)-2
=9.2×10-2
=92-2
=90