3.8+2.2×(0.7×0.3)简便运算
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3.8+2.2×(0.7×0.3)简便运算
![3.8+2.2×(0.7×0.3)简便运算](/uploads/image/z/8712430-70-0.jpg?t=3.8%2B2.2%C3%97%280.7%C3%970.3%29%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97)
3.8+2.2×(0.7×0.3)
=3.8+2.2*0.21=3.8+(2+0.2)*0.21=3.8+0.42+0.042=4.22+0.042=4.262
=3.8+2.2*0.21=3.8+(2+0.2)*0.21=3.8+0.42+0.042=4.22+0.042=4.262