1. 1 2/4 - 2/5 + 1 = 2. 1 2/4

Berikut ini adalah pertanyaan dari chirogaming896 pada mata pelajaran Matematika untuk jenjang Sekolah Menengah Pertama

1. 1 2/4 - 2/5 + 1 =2. 1 2/4 + 1 - 2/5 =
3. 1 3/4 x 2/5 + 1 =
4. 1 2/4 x 2/5 - 1 =
5. 1 2/4 : 2/5 + 1 =

Bantu jawab cuy, jgn lupa pake cara☝️

Jawaban dan Penjelasan

Berikut ini adalah pilihan jawaban terbaik dari pertanyaan diatas.

Nomor 1.

$1 \frac{2}{4} - \frac{2}{5} + 1 \\ \\ = 1 \frac{1}{2} - \frac{2}{5} + \frac{1}{1} \\ \\ = \frac{3}{2} - \frac{2}{5} + \frac{1}{1} \\ \\ = \frac{15 - 4 + 10}{10} \\ \\ = \frac{21}{10} = 2 \frac{1}{10}$

Nomor 2.

$1 \frac{2}{4} + 1 - \frac{2}{5} \\ \\ = 1 \frac{1}{2} + 1 - \frac{2}{5} \\ \\ = \frac{3}{2} + \frac{1}{1} - \frac{2}{5} \\ \\ = \frac{15 + 10 - 4}{10} \\ \\ = \frac{21}{10} = 2 \frac{1}{10}$

Nomor 3.

$(1 \frac{3}{4} \times \frac{2}{5} )+ 1 \\ \\ = (\frac{7}{4} \times \frac{2}{5} ) + \frac{1}{1} \\ \\ = ( \frac{7}{2} \times \frac{1}{5} ) + \frac{1}{1} \\ \\ = \frac{7}{5} + \frac{1}{1} \\ \\ = \frac{7 + 5}{5} = \frac{12}{5} = 2 \frac{2}{5}$

Nomor 4.

$(1 \frac{2}{4} \times \frac{2}{5}) - 1 \\ \\ = (1 \frac{1}{2} \times \frac{2}{5} ) - \frac{1}{1} \\ \\ = ( \frac{3}{2} \times \frac{2}{5} ) - \frac{1}{1} \\ \\ = ( \frac{3}{1} \times \frac{1}{5} ) - \frac{1}{1} \\ \\ = \frac{3}{5} - \frac{1}{1} = \frac{3 - 5}{5} \\ \\ = - \frac{2}{5}$

Nomor 5.

$(1 \frac{2}{4} \div \frac{2}{5}) + 1 \\ \\ =( 1 \frac{1}{2} \div \frac{2}{5} )+ \frac{1}{1} \\ \\ = ( \frac{3}{2} \times \frac{5}{2} ) + \frac{1}{1} \\ \\ = \frac{15}{4} + \frac{1}{1} \\ \\ = \frac{15 + 4}{4} = \frac{19}{4} \\ \\ = 4 \frac{3}{4}$