题目内容

脱式计算。(能简算的要简算)
(1)99×101 (2)25×36+25×4
(3)78×16+22×16 (4)45×14+19.4
(5)83×15+15×17 (6)6.8+12×11
(1)原式=99×(100+1)
                =9900+99
                =9999
(2)原式=25×(36+4)
                =25×40
                =1000
(3)原式=(78+22)×16
                =100×16
                =1600
(4)原式= 45×(10+4)+19.4
                = 450+180+19.4
                =946.4
(5)原式=15×(83+17)
                =15×100
                =1500
(6)原式=6.8+12×(10+1)
                =6.8+120+12
                =138.8
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