题目内容
| 怎样简便就怎样计算 355+260+140+245 | 102×99 |
| 98×34 | 645-180-245 |
| 382×101-382 | 4×60×50×8 |
| 35×8+35×6-4×35. |
(1)355+260+140+245,
=(355+245)+(260+140),
=600+400,
=1000;
(2)102×99,
=(100+2)×99,
=100×99+2×99,
=9900+198,
=10098;
(3)98×34,
=(100-2)×34,
=100×34-2×34,
=3400-68,
=3332;
(4)645-180-245,
=645-245-180,
=400-180,
=220;
(5)382×101-382,
=382×(101-1),
=382×100,
=38200;
(6)4×60×50×8,
=(4×50)×(60×8),
=200×480,
=96000;
(7)35×8+35×6-4×35,
=35×(8+6-4),
=35×10,
=350.
=(355+245)+(260+140),
=600+400,
=1000;
(2)102×99,
=(100+2)×99,
=100×99+2×99,
=9900+198,
=10098;
(3)98×34,
=(100-2)×34,
=100×34-2×34,
=3400-68,
=3332;
(4)645-180-245,
=645-245-180,
=400-180,
=220;
(5)382×101-382,
=382×(101-1),
=382×100,
=38200;
(6)4×60×50×8,
=(4×50)×(60×8),
=200×480,
=96000;
(7)35×8+35×6-4×35,
=35×(8+6-4),
=35×10,
=350.
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