题目内容
| 怎样简便就怎样计算. | ||||||||||
645-180-245 35×8+35×6-4×35. |
(1)355+260+140+245,
=(355+245)+(260+140),
=600+400,
=1000;
(2)102×99,
=102×(100-1),
=10200-102,
=10200-100-2,
=10100-2,
=10098;
(3)2×125,
=2×(100+25),
=200+50,
=250;
(4)382×101-382,
=382×(101-1),
=382×100,
=38200;
(5)4×60×50×8,
=4×60×50×2×4,
=240×100×4,
=240×4×100,
=960×100,
=96000;
(6)645-180-245,
=(645-245)-180,
=400-180,
=220;
(7)35×8+35×6-4×35,
=35×(8+6-4),
=35×10,
=350.
=(355+245)+(260+140),
=600+400,
=1000;
(2)102×99,
=102×(100-1),
=10200-102,
=10200-100-2,
=10100-2,
=10098;
(3)2×125,
=2×(100+25),
=200+50,
=250;
(4)382×101-382,
=382×(101-1),
=382×100,
=38200;
(5)4×60×50×8,
=4×60×50×2×4,
=240×100×4,
=240×4×100,
=960×100,
=96000;
(6)645-180-245,
=(645-245)-180,
=400-180,
=220;
(7)35×8+35×6-4×35,
=35×(8+6-4),
=35×10,
=350.
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