2017-04-08
展开全部
(1)23.43+1.8+4.57+5.2 =(23.43+4.57)+(1.8+5.2) =28+7 =35; (2)69×101 =69×(100+1) =69×100+69×1 =6900+69 =6969; (3)225×28+3×225-225 =225×(28+3-1) =225×30 =6750; (4)12.12-3.54+9.88 =12.12+9.88-3.54 =22-3.54 =18.46; (5)5600÷16 =5600÷(8×2) =5600÷8÷2 =700÷2 =350; (6)840+350-840+350 =(840-840)+(350+350) =0+700 =700.
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