小学二年级数学乘法与加减法混算

9x3+89=6x7+80=4x2+79=7x4+32=5x6+60=6x2+25=1x4+58=5x5-7=4x5+73=4x4+83=9x7+85=8x4+73=6x9-42=3x1+41=5x7