0.64*25*7.8+2.2用简便计算
解：
0.64*25*7.8+2.2
=4×0.16×25×7.8+2.2
=（4×25）×0.16×7.8+2.2
=100×0.16×7.8+2.2
=16×7.8+2.2
=15×7.8+7.8+2.2
=15×（8-0.2）+10
=15×8-15×0.2+10
=120-3+10
=127
16/7.8+2.2=124.8+2.2=127
0.64×25×7.8＋2.2＝0.8×25×0.8×7.8＋2.2＝16×7.8＋2.2＝124.8＋2.2＝127
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