英语算式1.twenty-one+six=------- 2.two+seventeen=-------3.sevent

1。twenty-one+six=__twenty-five____25_ 2。two+seventeen=_nineteen_19_____ 3。seventeen-six=___eleven__11___ 4。two 乘于 fifteen=__thirty 30_ 5。eight 除于 four=_two_____2_ 6。five 乘于 four=____twenty__20__ 7。thirty-nineteen=__eleven__11____ 8。thirty-nine=twenty-one___21______ 9。fourteen 乘于 two=_twenty-eight_28___ 10。eighteen 除于 two=_nine___9___