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简便计算.0.34×1014.86×990.5×7.6×203.78×0.8+3.78×0.290.5×99+90.55×0.2×8×1.258.57×103-8.57×3.
题目详情
简便计算. 0.34×101 | 4.86×99 |
0.5×7.6×20 | 3.78×0.8+3.78×0.2 |
90.5×99+90.5 | 5×0.2×8×1.25 |
8.57×103-8.57×3. |
▼优质解答
答案和解析
(1)0.34×101,
=0.34×(100+1),
=0.34×100+0.34,
=34+0.34,
=34.34;
(2)4.86×99,
=4.86×(100-1),
=4.86×100-4.86,
=486-4.86,
=481.44;
(3)0.5×7.6×20,
=(0.5×20)×7.6,
=10×7.6,
=76;
(4)3.78×0.8+3.78×0.2,
=3.78×(0.8+0.2),
=3.78×1,
=3.78;
(5)90.5×99+90.5,
=90.5×(99+1),
=90.5×100,
=9050;
(6)5×0.2×8×1.25,
=(5×0.2)×(8×1.25),
=1×10,
=10;
(7)8.57×103-8.57×3,
=8.57×(103-3),
=8.57×100,
=857.
=0.34×(100+1),
=0.34×100+0.34,
=34+0.34,
=34.34;
(2)4.86×99,
=4.86×(100-1),
=4.86×100-4.86,
=486-4.86,
=481.44;
(3)0.5×7.6×20,
=(0.5×20)×7.6,
=10×7.6,
=76;
(4)3.78×0.8+3.78×0.2,
=3.78×(0.8+0.2),
=3.78×1,
=3.78;
(5)90.5×99+90.5,
=90.5×(99+1),
=90.5×100,
=9050;
(6)5×0.2×8×1.25,
=(5×0.2)×(8×1.25),
=1×10,
=10;
(7)8.57×103-8.57×3,
=8.57×(103-3),
=8.57×100,
=857.
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