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4.9乘10.1用简便方法怎么计算

4.9x10.1 =4.9x(10+0.1) =4.9x10+4.9x0.1 =49+0.49 =49.49

4.9✘10.1简便计算 =4.9x10+4.9x0.1 =49+0.49 =49.49

=0.49×10×10.1-0.49 =0.49×101-0.49 =0.49×(101-1) =0.49×100 =49

4.9×10.1 =4.9×(10+0.1) =4.9×10+4.9×0.1 =49+0.49 =49.49

4.9×10.1 =4.9×(10+0.1) =4.9×10+4.9×0.1 =49+0.49 =49.49

2.5×4.4 =2.5×(4+0.4)

4.9×10.1 =4.9×(10+0.1) =4.9×10+4.9×0.1 =49+0.49 =49.49

解:×+5.4=10.1+4.9 ×+5.4=15 ×=15-5.4 ×=9.6

(1)4.9+0.1-4.9+0.1 =(4.9-4.9)+(0.1+0.1)=0+0.2=0.2; (2)12×3.7+5.2×0.5+1.1×50%=0.5×(3.7+5.2+1.1)=0.5×10=5;(3)12×(13+12-16) =12×13+12×12?12×16=4+6-2=8; (4)9.07×99+9.079.07×(99+1)=9.07×100=907;(5)58×1110+38÷...

10-(4.9+2.1×3/7) =10-(4.9+0.9) =10-5.8 =4.2

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