21.5×3.7+6.3×21.5的简便计算
(1)3.7+6.3×0.5(2)21.6÷3×(20-19.8)(3)2.5×2.9×4×2(4)16.53-3.57-6.43(5)5.28×9.8+0.2×5.28...
(1)3.7+6.3×0.5
(2)21.6÷3×(20-19.8)
(3)2.5×2.9×4×2
(4)16.53-3.57-6.43
(5)5.28×9.8+0.2×5.28
(6)28-2×9.5+2.8
(7)(10-9.2)×(2.6-2.1)÷5
(8)1.5×[(3.6-0.36÷0.6)-5]. 展开
(2)21.6÷3×(20-19.8)
(3)2.5×2.9×4×2
(4)16.53-3.57-6.43
(5)5.28×9.8+0.2×5.28
(6)28-2×9.5+2.8
(7)(10-9.2)×(2.6-2.1)÷5
(8)1.5×[(3.6-0.36÷0.6)-5]. 展开
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(1)3.7+6.3×0.5,
=3.7+3.15,
=6.85;
(2)21.6÷3×(20-19.8),
=7.2×0.2,
=1.44;
(3)2.5×2.9×4×2,
=(2.5×4)×(2.9×2),
=10×5.8,
=58;
(4)16.53-3.57-6.43,
=16.53-(3.57+6.43),
=16.53-10,
=6.53;
(5)5.28×9.8+0.2×5.28,
=(9.8+0.2)×5.28,
=10×5.28,
=52.8;
(6)28-2×9.5+2.8,
=28-19+2.8,
=9+2.8,
=11.8;
(7)(10-9.2)×(2.6-2.1)÷5,
=0.8×0.5÷5,
=0.4÷5,
=0.08;
(8)1.5×[(3.6-0.36÷0.6)-5],
=1.5×[(3.6-0.6)-5],
=1.5×[3-5],
=1.5×(-2),
=-3.
=3.7+3.15,
=6.85;
(2)21.6÷3×(20-19.8),
=7.2×0.2,
=1.44;
(3)2.5×2.9×4×2,
=(2.5×4)×(2.9×2),
=10×5.8,
=58;
(4)16.53-3.57-6.43,
=16.53-(3.57+6.43),
=16.53-10,
=6.53;
(5)5.28×9.8+0.2×5.28,
=(9.8+0.2)×5.28,
=10×5.28,
=52.8;
(6)28-2×9.5+2.8,
=28-19+2.8,
=9+2.8,
=11.8;
(7)(10-9.2)×(2.6-2.1)÷5,
=0.8×0.5÷5,
=0.4÷5,
=0.08;
(8)1.5×[(3.6-0.36÷0.6)-5],
=1.5×[(3.6-0.6)-5],
=1.5×[3-5],
=1.5×(-2),
=-3.
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