1.75%÷(0,4×1/4): - Universityku

2.20×(-6)÷2/3)÷(-20)
3.0,4×1/2+0,5
4.Berapakah nilai dari 20×(275+225)-128?

1.75%÷(0,4×1/4):

Jawab:

1. 75% ÷ ( 0,4 × 1/4 )

= $frac{75}{100}$ : ( $frac{4}{10}$ x $frac{1}{4}$ )

= $frac{75}{100}$ : $frac{1}{10}$

= $frac{75}{100}$ x $frac{10}{1}$

= $frac{75}{10}$ = $frac{15}{2}$ atau 7 $frac{1}{2}$ atau 7,5

2. 20 × (-6) ÷ 2/3) ÷ (-20 )

= 20 x ( -6 x $frac{3}{2}$ ) : ( -20 )

= 20 x ( -1 ) : ( -20 )

= ( -20 ) : ( -20 )

= 1

3. 0,4 × 1/2 + 0,5

= $frac{4}{10}$ x $frac{1}{2}$ + $frac{5}{10}$

= $frac{1}{5}$ + $frac{5}{10}$

= $frac{1}{5}$ + $frac{1}{2}$

= $frac{2}{10}$ + $frac{5}{10}$

= $frac{7}{10}$

4. 20 × (275 + 225 ) – 128

= 20 x 500 – 128

= 1.000 – 128

= 872