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3.2Ⅹ9.9 0.32脱式计算,能简算的要简算

应该是 3.2Ⅹ9.9+0.32 =3.2×(9.9+0.1) =3.2×10 =32

4.8x9.9脱式计算能简算要简算 4.8x9.9 =4.8*10-4.8*0.1 =48-0.48 =47.52

7.8×9.9脱式计算(能简便的就简便) 7.8×9.9 =7.8*(10-0.1) =7.8*10-7.8*0.1 =78-0.78 =77.22

2-6/13÷9/29-2/3 解:根据约分和通分的运用, 原式=2-6/13÷9/29-2/3 =2-6/13x29/9-2/3 =2-58/39-2/3 =2-1-19/39-26/39 =1-45/39 =-6/39 =-2/13

(1/6+1/9-1/12)x36 =36/6+36/9-36/12 =6+4-3 =7

(1)0.8×3.9×1.25=0.8×1.25×3.9=1×3.9=3.9(2)4.87×2.34+4.87×7.66=4.87×(2.34+7.66)=4.87×10=48.7(3)0.49×9.9=0.49×(10-0.1)=0.49×10-0.49×0.1=4.9-0.049=4.851(4)60.8-7.18-12.82=60.8-(7.18+12.82)=60.8-20=40.8(5)2.5×3.2×12...

1.9+19点9+199点9+0点3 =2-0.1+20-0.1+200-0.1+0.3 =(2+20+200)-(0.1+0.1+0.1)+0.3 =222-0.3+0.3 =222

2/9÷0.3 =2/9÷3/10 =2/9×10/3 =20/27

7.8-6.9-(4.5-2.9) =7.8-6.9+2.9-4.5 =3.8-4.5 = - 0.7 如有帮助请采纳, 如对本题有疑问可追问,Good luck!

①1.25×4.8,=1.25×8×0.6,=10×0.6,=6; ②5.5×9.9+0.1×5.5,=(9.9+0.1)×5.5,=10×5.5,=55; ③3.45×102,=3.45×(100+2),=3.45×100+3.45×2,=345+6.9,=351.9;④3.17+0.83×1.6,=3.17+1.328,=4.498.

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