4+19的38倍是多少?
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解:4+19的38倍等于( 726 )
∵已知需求出4+19的38倍等于多少
∴4+19的38倍
= 4 + 19 × 38
= 4 + (20 - 1)× 38
= 4 + 20 × 38 - 1 × 38
= 4 + 760 - 38
= 764 - 38
= (760 + 4)- (40 - 2)
= 760 + 4 - 40 + 2
= (760 - 40)+(4 + 2)
= 720 + 6
= 726
答:4+19的38倍等于726
∵已知需求出4+19的38倍等于多少
∴4+19的38倍
= 4 + 19 × 38
= 4 + (20 - 1)× 38
= 4 + 20 × 38 - 1 × 38
= 4 + 760 - 38
= 764 - 38
= (760 + 4)- (40 - 2)
= 760 + 4 - 40 + 2
= (760 - 40)+(4 + 2)
= 720 + 6
= 726
答:4+19的38倍等于726
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