1.229＋378÷18＋75
=1.229＋21＋75
=1.229＋(21＋75)
=1.229＋96
=97.229
0.4＋2.6÷(4.7－3.4)
=0.4＋2.6÷1.3
=0.4＋2
=2.4
(40－35×7分之2)×10分之9
=(40－10)×9/10
=30×9/10
=27
345－2442÷37＋34
=345－66＋34
=345+34－66
=379－66
=313