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1.25×0.25×8×40用简便方法计算 5.7×9.9 0.34×10.1

计算题

简便计算。9.9×5.7+0.57 =9.9×5.7+5.7×0.1 =(9.9+0.1)×5.7 =10×5.7=57 4.23×10.1-0.423 =4.23×10.1-4.23×0.1 =4.23×(10.1-0.1) =4.23×10 =42.3 1.25×8.8 =1.25×8×1.1 =10×1.1 =11

用简便方法计算10.1乘以7.9等于 解答 10.1×7.9 =(10+0.1)×7.9 =79+0.79 =79.79

详细步骤写在纸上了

8·88×1.25×9十0.1 =1.11×8×1.25×9十0.1 =1.11×9×(8×1.25)+0.1 =9.99×10+0.1 =99.9+0.1 =100

您好!7.36乘3.4+6.6乘7.36=7.36×(3.4+6.6)=7.36×10=73.65.8乘9.9+5.8乘0.1=5.8×(9.9+0.1)=5.8×10=581.25乘2.5乘32=(1.25×8)×(2.5×4)=10×10=10048乘0.25=(4×0.25)×12=128.3乘9.9=8.3×(10-0.1)=8.3×10-8.3×0.1=83-0.83=82.17100.1乘3...

原式=9.9×2.8+2.8×0.1=2.8×(9.9+0.1)=2.8×10=28 原式=1.1×(10+0.1)=1.1×10+1.1×0.1=11+0.11=11.11

1×1+2×2+3×3+4×4+5×5+6×6+7×7+8×8+9×9+10×10+11×11=(1×1+11×11)+(2×2+10×10)+(3×3+9×9)+(4×4+8×8)+(5×5+7×7)+6×6=[(11+1)(11-1)+2]+[(10+2)(10-2)+8]+[(9+3)(9-3)+18]+[(8+4)(8-4)+32]+[(7+5)(7-5)+50]+36=12×10+...

=1+19+2+18+……+10 =20×9+10 =180+10 =190

1+2+3+4+5+6+7+8+9+10+…+100=100×(100+1)2=50×101=5050.

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