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题型:填空题 题类:常考题 难易度:普通
9的乘法口诀1876 10
99=81 29=18
81=7 81=99
2×{#blank#}1{#/blank#}=18
9×{#blank#}2{#/blank#}=18
54= × ,27= × 8= ×
12= × 18= × 45= ×
5×9和9×5都可用口诀“五九四十五”计算.
4×6= 5×6= 6×6=
6×7 6×8= 6×9=
5×{#blank#}1{#/blank#}=30 3×{#blank#}2{#/blank#}=27 8×{#blank#}3{#/blank#}=32
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