解: 138+34x22
=2x(69+34x11)
=2x(69+374)
=2x(70+374-1)
=2x(444-1)
=2x443
=886
138+34×22
＝138+748
＝886
138+34×22
= 138+34×20+34×2
= 138+680+68
=886
138+34x22
=132+6+34x22
=6 x22+6+34 x22
=(6+34)x22+6
=40 x22+6
=886
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