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3.9x7.8 6.1x7.5怎么计算简便

3.9=4-0.1,7.8=8-0.2,6.1=6+0.1,7.5=7+0.5,重新带入,提取公因式

① 2.6×7.8+3.6×2.2 =2.6×2×3.6+3.6×2.2 =3.6×5.2+3.6×2.2 =3.6×(5.2+2.2) =3.6×7.4 =26.64 ② 8.9×1.2-7.5 =10.68-7.5 =3.18 ③ 4.89×(5.2+6.8) =4.89×12 =58.68 如果不懂,请追问,祝学习愉快!

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