1.2乘以98等于几?用速算法

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1.2乘以98等于几?用速算法

1.2×98
= 1.2×(100-2)
= 1.2×100-1.2×2
= 120-2.4
= 117.6

1.2×98
=1.2×(100-2)
=1。2×100-1.2×2
=120-2.4
=117.6

1.2×98
=1.2×(100-2)
=1.2×100-1.2×2
=120-2.4
=117.6

原式=1.2×(100-2)
=120-2.4
=117.6