Question

35°41′+21°27′= 116°1-分-48°39分= 20°15×5= 270°÷7=（这题270°÷7要精确到分）

过程详细点

Answer 1

解：35°41′+21°27′
=(35°+21°)+(41′+27′)
=56°+68′
=56°+60′+8′
=56°+1°+8′
=57°8′

116°1′-48°39′
=115°61′-48°39′
=(115°-48°)+(61′-39′)
=67°+22′
=67°22′

20°15′×5
=(20°+15′)×5
=20°×5+15′×5
=100°+75′
=100°+60′+15′
=100°+1°+15′
=101°15′

270°÷7
=(266°+4°)×1/7
=(266°+240′)×1/7
=266°×1/7+240′×1/7
≈38°+34′
≈38°34′

Answer 2

解：35°41′+21°27′
=(35°+21°)+(41′+27′)
=56°+68′
=56°+60′+8′
=56°+1°+8′
=57°8′

116°1′-48°39′
=115°61′-48°39′
=(115°-48°)+(61′-39′)
=67°+22′
=67°22′

20°15′×5
=(20°+15′)×5
=20°×5+15′×5
=100°+75′
=100°+60′+15′
=100°+1°+15′
=101°15′

270°÷7
=(266°+4°)×1/7
=(266°+240′)×1/7
=266°×1/7+240′×1/7
≈38°+34′
≈38°34′

Answer 3

I不明白