五年级上册数学小数乘除法简便计算
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简介
一、小数乘法 7.5×0.8×1.25 =7.5×(0.8×1.25) =7.5×1 =7.5 4.9×5.5+4.9×4.5 =4.9×(5.5+4.5) =4.9×10 =49 2.5×0.7×4 =2.5×4×0.7 =10×0.7 =7 1.25×32×2.5 =(1.25×8)×(2.5×4) =10×10 =100 0.25×(40+4) =0.25×40+0.25×4 =10+1 =11 6.7×0.25×80 =6.7×(0.25×80) =6.7×20 =134 0.125×(80-8) =0.125×80-0.125×8 =10-1 =9 9×58 =10×58-1×58 =580-58 =522 6.8×3.5-6.8×2.5 =6.8×(3.5-2.5) =6.8×1 =6.8 40.1×0.25 =(40+0.1)×0.25 =40×0.25+0.1×0.25 =10+0.025 =10.025 9.7×99+9.7 =9.7×99+9.7×1 =9.7×(99+1) =9.7×100 =970 1.25×7+1.25 =1.25×7+1.25×1 =1.25×(7+1) =1.25×8 =10
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