Three fifths of a meter equals () centimeters, three thousandths of an eight gram equals (), five fifths of an hour equals () minutes?

Three fifths of a meter equals () centimeters, three thousandths of an eight gram equals (), five fifths of an hour equals () minutes?

60 cm, 375 g, 25 min

7 / 9 minus 11 / 12 plus 1 / 6

7 / 9 minus 11 / 12 plus 1 / 6
=7/9 - 11/12 +1/6
= ( 28-33+6) /36
= 1/36
one-thirty-sixth

Can 199 ^ 3-199 be divided by 198? Can 25 ^ 5 + 5 ^ 11 be divided by 30?

199^3-199
=199*(199^2-1)
=199*(199+1)(199-1)
=199 * 200 * 198, divisible by 198
25^5+5^11
=5^10+5^11
=5^10*(1+5)
=6*5^10
=6*5*5^9
=30 * 5 ^ 9, divisible by 30

100×199-199×198+198×197-197×196+… +2×1=______ ．

100×199-199×198+198×197-197×196+… +2×1=200×199-199×198+198×197-197×196+… +2×1-100×199，=（200-198）×199+（198-196）×197+… +（4-2）×3+2×1-100×199=2×（199+197+… +3 + 1) - 100 × 199 = 20000-19900 = 100

197 + 204 + 199 + 202 how to do it in a simple way

197+204+199+202
=200+200+200+200-3+4-1+2
=800+2
=802

13.4 minus 7.99 is calculated by a simple method

13.4-7.99=13.4-8+0.01=5.4+0.01=5.41

Simple calculation of 62 times 105 minus 62 times 5

62×105-62×5
=62×(105-5)
=62×100
=6200

8.3-2.63 + 2.73 × 1.5 (simple calculation)

8.3-2.63+2.73×1.5
=8.3-（2.73-0.1）+2.73×1.5
=8.3+0.1-2.73+2.73×1.5
=8.4+2.73×（1.5-1）
=8.4+2.73×0.5
=8.4+1.365
=9.765

Simple calculation of 28 × 25

28×25
=7×4×25
=7×（4×25）
=7×100
=700

25 * 28 simple calculation

25x28
=25x4x7
=100x7
=700