简便计算 355+260+140+245 98×101 48×125 645-180-245 38×99+38 3500÷14÷5 175×56
简便计算355+260+140+24598×10148×125645-180-24538×99+383500÷14÷5175×56+25×5650×25×20×40....
简便计算 355+260+140+245 98×101 48×125 645-180-245 38×99+38 3500÷14÷5 175×56+25×56 50×25×20×40.
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(1)355+260+140+245
=(355+245)+(260+140)
=600+400,
=1000;
(2)98×101
=90×(100+1),
=90×100+98,
=9000+98,
=9098;
(3)48×125
=6×(8×125),
=6×1000,
=6000;
(4)645-180-245
=645-245-180,
=400-180,
=220;
(5)38×99+38
=(99+1)×38,
=100×38,
=3800;
(6)3500÷14÷5
=3500÷(14×5),
=3500÷70,
=50;
(7)175×56+25×56
=(175+25)×56,
=200×56,
=11200;
(8)50×25×20×40
=50×20×(25×40),
=1000×1000,
=1000000.
=(355+245)+(260+140)
=600+400,
=1000;
(2)98×101
=90×(100+1),
=90×100+98,
=9000+98,
=9098;
(3)48×125
=6×(8×125),
=6×1000,
=6000;
(4)645-180-245
=645-245-180,
=400-180,
=220;
(5)38×99+38
=(99+1)×38,
=100×38,
=3800;
(6)3500÷14÷5
=3500÷(14×5),
=3500÷70,
=50;
(7)175×56+25×56
=(175+25)×56,
=200×56,
=11200;
(8)50×25×20×40
=50×20×(25×40),
=1000×1000,
=1000000.
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