15.37×7.8-9.37×7.8+15.84×2.2-9.84×2.2简便算
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15.37×7.8-9.37×7.8+15.84×2.2-9.84×2.2简便算15.37×7.8-9.37×7.8+15.84×2.2-9.84×2.2简便算15.37×7.8-9.37×7.8+1
15.37×7.8-9.37×7.8+15.84×2.2-9.84×2.2简便算
15.37×7.8-9.37×7.8+15.84×2.2-9.84×2.2简便算
15.37×7.8-9.37×7.8+15.84×2.2-9.84×2.2简便算
15.37×7.8-9.37×7.8+15.84×2.2-9.84×2.2
=(15.37-9.37)X 7.8 + (15.84-9.84)X 2.2
=6 X7.8 + 6 X 2.2
=6 X (7.8+2.2)
=6X10
=60
15.37×7.8-9.37×7.8+15.84×2.2-9.84×2.2简便算
15.37*7.88-9.37*7.88+15.37*2.12-9.37*2.12简算
7.8
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7.8.
7.8
7.8
7.8.
简算：15.37*7.98-9.37*7.98+15.37*2.11-0.937*21.1
简算：15.37*7.98-9.37*7.98+15.37*2.11-1.937*21.1
37*7.88-9.37*7.88+15.37*2.12-9.37*2.12 简便方法
7.8÷0.25×4＝7.8÷1＝7.8()
15.37×7.88-9.37×7.88+15.37×2.12-9.37×2.12的简便计算