赞 zwmufo2002 花朵
共回答了25个问题采纳率：84% 举报
(1)1.25×24 =1.25 ×8×3 = 10 ×3 = 30
1.25 ×24 = 1.25 ×4 ×6 = 5×6 = 30
(2)9.9×102 = 10×102 - 0.1 ×102 = 1020 - 10.2 = 1009.8
9.9 ×102 = 9.9 ×100 + 9.9 ×2 = 990 + 19.8 = 1009.8
1.25 ×24 = 1.25 ×4 ×6 = 5×6 = 30
(2)9.9×102 = 10×102 - 0.1 ×102 = 1020 - 10.2 = 1009.8
9.9 ×102 = 9.9 ×100 + 9.9 ×2 = 990 + 19.8 = 1009.8
1年前
10
tanwubuhao 幼苗
共回答了25个问题 举报
(1)1.25×24
=1.25x8x3
=10x3
=30
(2)9.9×102
=（10-0.1）x102
=1020-10.2
=1009.8
=1.25x8x3
=10x3
=30
(2)9.9×102
=（10-0.1）x102
=1020-10.2
=1009.8
1年前
1
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