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2.3x7.8+9.9x7.2+2.3x2.1 =(2.3x7.8+2.3x2.1)+9.9x7.2 =2.3x(7.8+2.1)+9.9x7.2 =2.3x9.9+9.9x7.2 =9.9x(2.3+7.2) =9.9x10.0 =99

9.9x2.3 =(10-0.1)x2.3 =10x2.3+0.1x2.3 =23-0.23 =22.77 希望能帮到你!

2.73x99 =2.73x(100-1) =2.73x100-2.73 =273-2.73 =270.27

2.4×4-<0.1+3.8>=5.7。

2.3+9×(22-19.7) =2.3+9×2.3 =2.3×(1+9) =2.3×10 =23

题目表述不清,无法作答

8.9×2.3+2.3 =(8.9+1)×2.3 =9.9×2.3 =22.77 你好,本题已解答,如果满意 请点右下角“采纳答案”。

9.32×93.2+7.8×9.32-9.32 =9.32×(93.2+7.8-1) =9.32×100 =932

原式 49.8x2.73+2.73x50.3+0.273 =49.8x2.73+2.73x50.3+2.73x0.1 =2.73x(49.8+50.3+0.1) =2.73x(100.1+0.1) =2.73x100.2 =2.73x100+2.73x0.2 =273+0.546 =273.546

9.99×2.22+3.33×3.34 =3.33×3×2.22+3.33×3.34 =3.33×6.66+3.33×3.34 =3.33×(6.66+3.34) =3.33×10 =33.3

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