1. -4 + 65 × 25=... 2. 535 + (-325) ÷ (-13 ) - 420=..... 3. luas lingkaran 154 cm2 hitung jari jarinya......

1.
- 4 + 65 × 25
= - 4 + 1.625
= 1.621

2.
535 + (- 325) ÷ (- 13) - 420
= 535 + 25 - 420
= 560 - 420
= 140

3.
Diketahui :
- Luas Lingkaran = 154 cm²

Ditanya : Jari - Jari = ....?

Penyelesaian :
- Jari - Jari :
L = π × r × r
154 = 22/7 × r²
r² = 154 × 7/22
r² = 49
r = √49
r = 7 cm

Maaf Kalau Salah

1. -4 + (65 x 25)
= -4 + 1.625
= 1.621

2. 535 + ((-325) : (-13)) - 420
= 535 + 25 - 420
= 560 - 420
= 140