3.9×9.7和12.8×10.4简便计算

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3.9×9.7和12.8×10.4简便计算3.9×9.7和12.8×10.4简便计算3.9×9.7和12.8×10.4简便计算12.8X10.4=128+5.12=133.123.9X9.7=(4-0

3.9×9.7和12.8×10.4简便计算
3.9×9.7和12.8×10.4简便计算

3.9×9.7和12.8×10.4简便计算

12.8 X 10.4
= 128 + 5.12
= 133.12
3.9 X 9.7
= ( 4 - 0.1 ) X ( 10 - 0.3 )
= 40 - 1.2 - 1 + 0.03
= 40.03 - 2.2
= 37.83