脱式计算(能简算的要用简算)12.5×0.4×2.5×89.5×10143.2-1.8
答案:1 悬赏:10 手机版
解决时间 2021-01-23 21:17
- 提问者网友:無理詩人
- 2021-01-22 20:39
脱式计算(能简算的要用简算)12.5×0.4×2.5×89.5×10143.2-1.8
最佳答案
- 五星知识达人网友:夜余生
- 2021-01-22 22:11
①12.5×0.4×2.5×8
=(12.5×8)×(0.4×2.5)
=100×1
=100
②9.5×101
=9.5×(100+1)
=9.5×100+9.5
=959.5
③43.2-1.8×3-4.6
=43.2-5.4-4.6
=43.2-(5.4+4.6)
=33.2
④4.2×7.8+2.2×4.2
=4.2×(7.8+2.2)
=4.2×10
=42
⑤0.87×3.16+4.64
=2.7492+4.64
=7.3892
⑥12.5×4.8
=12.5×(4+0.8)
=12.5×4+12.5×0.8
=50+10
=60
=(12.5×8)×(0.4×2.5)
=100×1
=100
②9.5×101
=9.5×(100+1)
=9.5×100+9.5
=959.5
③43.2-1.8×3-4.6
=43.2-5.4-4.6
=43.2-(5.4+4.6)
=33.2
④4.2×7.8+2.2×4.2
=4.2×(7.8+2.2)
=4.2×10
=42
⑤0.87×3.16+4.64
=2.7492+4.64
=7.3892
⑥12.5×4.8
=12.5×(4+0.8)
=12.5×4+12.5×0.8
=50+10
=60
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