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15个人跑100米，每5人一组，分成了{#blank#}1{#/blank#}组

5×{#blank#}1{#/blank#}=40      9×{#blank#}2{#/blank#}=36     42÷7={#blank#}3{#/blank#}

9×{#blank#}4{#/blank#}=72      {#blank#}5{#/blank#}÷8=8      35÷{#blank#}6{#/blank#}=5

80-60=         50 +20=        85-80=      73 +20=

83-9=            47+8=          56-34 =       23+55=

3×7=             49÷7=        4×8=         32÷4=

5×9=              18÷9=         6×4 =        12÷2=

8×7+8=            3×7+26=       6×7-25 =     48÷8+45=