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用简便法计算.0.89×1011.25×(8-0.8)2.7×4.3+5.7×2.76.18×9.9+0.6183.85-0.19-1.811.25×3.26×8
题目详情
用简便法计算.
0.89×101 | 1.25×(8-0.8) | 2.7×4.3+5.7×2.7 |
6.18×9.9+0.618 | 3.85-0.19-1.81 | 1.25×3.26×8 |
▼优质解答
答案和解析
(1)0.89×101
=0.89×(100+1)
=0.89×100+0.89
=89+0.89
=89.89
(2)1.25×(8-0.8)
=1.25×8-1.25×0.8
=10-1
=9
(3)2.7×4.3+5.7×2.7
=2.7×(4.3+5.7)
=2.7×10
=27
(4)6.18×9.9+0.618
=6.18×9.9+0.1×6.18
=6.18×(9.9+0.1)
=6.18×10
=61.8
(5)3.85-0.19-1.81
=3.85-(0.19+1.81)
=3.85-2
=1.85
(6)1.25×3.26×8
=1.25×8×3.26
=10×3.26
=32.6
=0.89×(100+1)
=0.89×100+0.89
=89+0.89
=89.89
(2)1.25×(8-0.8)
=1.25×8-1.25×0.8
=10-1
=9
(3)2.7×4.3+5.7×2.7
=2.7×(4.3+5.7)
=2.7×10
=27
(4)6.18×9.9+0.618
=6.18×9.9+0.1×6.18
=6.18×(9.9+0.1)
=6.18×10
=61.8
(5)3.85-0.19-1.81
=3.85-(0.19+1.81)
=3.85-2
=1.85
(6)1.25×3.26×8
=1.25×8×3.26
=10×3.26
=32.6
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