巧算思考题
巧算:
77×13+255×999+510
999×87.5+87.5
808×0.125-1600÷16
3.49+4.47+3.51+2.38+4.53+2.62
732066×55555×(4-3.2÷0.8)
0.45-【10-(0.2+6.37÷0.7)】×0.5
19.98×37+199.8×1.9+1998×0.82
(8.4×2.5+9.7)÷(1.05÷1.5+8.4÷0.28)
0.9+0.99+0.999+0.9999+0.99999
(72×357+357×28)÷(51×7×4)
98989898×99999999÷1010101÷11111111