Suhu freezer saat normal terhubung listrik sekitar $$-17\degree C$$ . Saat listrik padam suhu freezer naik $$3\degree C$$ tiap 5 menit. Jika listrik padam selama $$\frac{3}{4}$$ jam, maka suhu freezer adalah....

$$\frac{3}{4}\ jam\ =\ \frac{3}{4}\times60\ menit\ =\ 45\ menit$$ $$Suhu\ freezer\ =\ -17+3\left(\frac{45}{5}\right)$$ $$Suhu\ freezer\ =\ -17+3\left(9\right)$$ $$Suhu\ freezer\ =\ -17+27$$ $$Suhu\ freezer\ =\ 10\degree C$$

Hasil dari $$4\frac{2}{3}-1\frac{1}{2}\div2\frac{1}{4}=....$$

$$4\frac{2}{3}-1\frac{1}{2}\div2\frac{1}{4}=\frac{14}{3}-\frac{3}{2}\div\frac{9}{4}$$ $$=\frac{14}{3}-\frac{3}{2}\times\frac{4}{9}$$ $$=\frac{14}{3}-\frac{2}{3}$$ $$=\frac{12}{3}$$ $$=4$$

$$3\left(2x-4y\right)-5\left(2x+3y\right)=....$$

$$3\left(2x-4y\right)-5\left(2x+3y\right)=6x-12y-10x-15y$$ $$=-4x-27y$$

Hasil dari $$\left(3x+2\right)\left(3x-2\right)$$ adalah....

$$\left(3x+2\right)\left(3x-2\right)=9x^2-6x+6x-4$$ $$=9x^2-4$$

Sebuah persegi memiliki panjang sisi $$2x+3$$ , luas persegi tersebut adalah....

$$L=\left(2x+3\right)^2$$ $$L=4x^2+12x+9$$

Persegi panjang mempunyai panjang 3 kali lebarnya. Jika keliling persegi panjang 96 cm, maka luas persegi panjang adalah....

Diketahui= $$p=3l$$ $$K=96\ cm$$ Ditanya= luas? Jawab= $$2\left(p+l\right)=96$$ $$p+l=48$$ $$3l+l=48$$ $$4l=48$$ $$l=12\ cm$$ $$p=3\left(12\right)=36\ cm$$ $$L=36\times12$$ $$L=432\ cm^2$$

Tes Diagnostik Kelas 7 Kartu Flash

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1.

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Dalam 10 jam seseorang dapat menjahit 4 kemeja. Waktu yang diperlukan untuk menjahit 12 kemeja adalah....

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2.

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Sebuah panti asuhan mempunyai persediaan beras cukup untuk 40 anak selama 30 hari. Jika ada 20 anak lagi masuk panti tersebut, maka persediaan makanan akan habis dalam waktu....

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FLASHCARD QUESTION

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5.

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Bentuk yang senilai dengan 0,125 adalah....

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6.

FLASHCARD QUESTION

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-5

7.

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