估算79x41先把79看作几
估算79x41先把79看作几 -
估算79x41先把79看作80.
79*41可估为80*40=3200
估算79x41先把79看作80.
79*41可估为80*40=3200
79x41用竖式计算?
59x79+79x41=(41 + 59)x(79
59x79+79x41=( + )x( ) -
59x79+79x41=(59+41)x79
42*79 =42*80-42 =3360-42 =3318
79x41十79简便方法计算? -
79×41+79 =79×(41+1)79×42 =(80-1)(40+2)3200+160-40-2 =3318 所以答案为3318。