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0.1×45×10×12=?用简便方法计算

0.1×45×10×12 =(0.1×10)×45×(3×4) =1×45×4×3 =180×3 =540 这个方法最简便

3.45x10.1 =3.45x10+3.45x0.1 =34.5+0.345 =34.845

8.55+0.45 =9

8.7x10.1 =8.7x(10+0.1) =8.7x10+8.7x0.1 =87+0.87 =87.87

1.25×0.25×8×40 =(1.25×8)×(0.25×40) =10×10 =100 5.7×9.9 =5.7×(10-0.1) =5.7×10-5.7×0.1 =57-0.57 =56.43 0.34×10.1 =0.34×(10+0.1) =0.34×10+0.34×0.1 =3.4+0.034 =3.434 12.5×(10+0.8) =12.5×10+12.5×0.8 =125+10 =135 44.5×3.7+6.3×44.5 =4...

8.45-0.45*0.1简便计算 8.45-0.45×0.1 =8.45-0.045 =8.405

65×10.1 =65×10+65×0.1 =650+6.5 =656.5

10.1-10.1÷1.01×0.1 =10.1-1×0.1 =10.1-0.1 =10

(1)45.07+(4.93+8.62),=45.07+13.55,=58.62;(2)12.5×(80+0.8),=12.5×80+12.5×0.8,=1000+10,=1010;(3)34.26+47.7-55.3+2.53,=34.26+(47.7+2.53)-55.3,=34.26+50.23-55.3,=84.49-55.3,=29.19;(4)13.2-180÷45×2.6,=13.2...

(1)1.97×0.25×0.4=1.97×(0.25×0.4)=1.97×0.1=0.197;(2)(2.5+0.25)×0.8=2.5×8+0.25×8=20+2=22;(3)3.2×12.5=(4×0.8)×12.5=4×(0.8×12.5)=4×10=40;(4)5.71×8.3-5.71×7.3=5.71×(8.3-7.3)=5.71×1=5.71;(5)0.25×0.44=0.25×(4×...

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