☆3.6×5.4= 4.2×2.03=
3.45×2.3= 6.8×0.76≈(保留两位小数)
(得数保留两位小数)
5.08×2.6= ☆2.32×7.5= 1.05×1.6≈(得数保留一位小数)
4.5×12 0.8×0.26 0.65×0.13
3.14×0.8 0.49×5.3(保留两位小数) 2.5×0.44
4.2×0.8= 2.7×0.11= ☆2.9×0.56=
2.06×4.8= 8.5×0.208= 6.23×4.2≈(精确到百分位)
5.2×6.4+4.8×6.4 0.5×4.8×1.25 6.36×7.5+0.75×36.4
0.78×101 5.4×3.2+3.2×4.6 1.25×32×2.5
8.72×101-8.72 2.5×12.5×40×0.8
8.4×0.6+9.4
32×1.25×0.25
3.75×10.2
3.9×8.2+1.8×3.9
18-3.35-5.65 2.78×0.02+0.98×2.78 8.5×101
3.6×202 2.65-0.5×0.5=
4×0.8×1.25×0.25 9.5×90+95
1.25×1.97×0.8 0.67×101 88×5.6+5.6×12
15.6-6.03÷0.67 7.2×17.3+2.7×7.2 0.64×101
⑴5.6-1.2-2.8+4.4 ⑵7.86×101-7.86
8.52﹣(5.52+0.9)
4×(9.3﹣5.7)+3.6
7.5×101
(0.38+0.38+0.38+0.38)×2.5
(12.5+2.5)×0.8 38.4-[1.2×(13.6-11.6)]
7.1×0.64+9.36 100-(4.5+3.2×25)
7.08×2.7+7.08×7.3 2.33×1.25×8 3.14×102
12.5×(0.78×0.8)
36.98×2.6+369.8×0.74
[78-(9.41+28.99)]-0.18
23.5×17.6-23.5×7.6 2.5×3.2×1.25 7.5+2.5×4 43.56×7.2+7.2×57.44-7.2