Toán Lớp 7: 1.5/18+7/25-5/18+18/25-0.75
3/5×15.1/4-3/5×6.1/4
-7/15×5/8×15/-7x(-16)
√(-7)^2+√25/16-3/2
1/2x√100-√1/16+(1/3)^0
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Toán Lớp 7: 1.5/18+7/25-5/18+18/25-0.75
3/5×15.1/4-3/5×6.1/4
-7/15×5/8×15/-7x(-16)
√(-7)^2+√25/16-3/2
1/2x√100-√1/16+(1/3)^0
Comments ( 1 )
1 5/18 + 7/25 – 5/18 + 18/25 – 0,75
= 1 + 5/18 + 7/25 – 5/18 + 18/25 – 3/4
= (5/18 – 5/18) + (7/25 + 18/25) + (1-3/4)
= 1+ 1/4
= 5/4
3/5 . 15 1/4 – 3/5 . 6 1/4
= 3/5 . (15 1/4 – 6 1/4)
= 3/5 . (15 + 1/4 – 6 – 1/4)
= 3/5 . 9
= 27/5
-7/15 . 5/8 . 15/(-7) . (-16)
= 7/15 . 5/8 . 15/7 . 16
= (7 . 5 . 15 . 16)/(15 . 8 . 7)
= (5 . 2)/1
= 10
\sqrt{(-7)^2} + \sqrt{25/16} – 3/2
= 7 + 5/4 – 3/2
= 33/4 – 3/2
= 27/4
1/2 . \sqrt{100} – \sqrt{1/16} + (1/3)^0
= 1/2 . 10 – 0,25 + 1
= 5 – 0,25 + 1
= 19/4 +1