简便运算,算出得数,3.78x2.5 9.8+99.8+0.2x3 2.3x85+23x1.5 34.17x990+341.7 95.6x18+4x1.8 5.13除以12.5 0.385x267+0.733x385 14.8x3.7+14.8x62+0.148x100 (19分之1+7分之2)x19x17以上简算题能够全部算出,并步骤齐全,得数对!只

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