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(1)7.74×(2.8-1.3)+1.5×2.26(2)2.22×9.9+6.66×6.7(3)(1.04×8.05)÷(3.24÷32.4)(4)1.8÷[(9.8-4.6)÷0.13-39.6](5)3.85×1.2+98×0.385-3.85(6)15.6×13.1-15.6-15.6×2.1.
题目详情
(1)7.74×(2.8-1.3)+1.5×2.26 | (2)2.22×9.9+6.66×6.7 |
(3)(1.04×8.05)÷(3.24÷32.4) | (4)1.8÷[(9.8-4.6)÷0.13-39.6] |
(5)3.85×1.2+98×0.385-3.85 | (6)15.6×13.1-15.6-15.6×2.1. |
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答案和解析
(1)7.74×(2.8-1.3)+1.5×2.26,
=7.74×1.5+1.5×2.26,
=1.5×(7.74+2.26),
=1.5×10,
=15;
(2)2.22×9.9+6.66×6.7,
=2.22×3×3.3+6.66×6.7,
=6.66×3.3+6.66×6.7,
=6.66××(3.3+6.7),
=6.66×10,
=66.6;
(3)(1.04×8.05)÷(3.24÷32.4),
=8.372÷0.1,
=83.72;
(4)1.8÷[(9.8-4.6)÷0.13-39.6],
=1.8÷[5.2÷0.13-39.6],
=1.8÷[40-39.6],
=1.8÷0.4,
=4.5;
(5)3.85×1.2+98×0.385-3.85,
=3.85×1.2+9.8×3.85-3.85,
=3.85×(1.2+9.8-1),
=3.85×10,
=38.5;
(6)15.6×13.1-15.6-15.6×2.1
=15.6×(13.1-1-2.1),
=15.6×10,
=156.
=7.74×1.5+1.5×2.26,
=1.5×(7.74+2.26),
=1.5×10,
=15;
(2)2.22×9.9+6.66×6.7,
=2.22×3×3.3+6.66×6.7,
=6.66×3.3+6.66×6.7,
=6.66××(3.3+6.7),
=6.66×10,
=66.6;
(3)(1.04×8.05)÷(3.24÷32.4),
=8.372÷0.1,
=83.72;
(4)1.8÷[(9.8-4.6)÷0.13-39.6],
=1.8÷[5.2÷0.13-39.6],
=1.8÷[40-39.6],
=1.8÷0.4,
=4.5;
(5)3.85×1.2+98×0.385-3.85,
=3.85×1.2+9.8×3.85-3.85,
=3.85×(1.2+9.8-1),
=3.85×10,
=38.5;
(6)15.6×13.1-15.6-15.6×2.1
=15.6×(13.1-1-2.1),
=15.6×10,
=156.
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