2.5×5= 10+0.4= 2.5×0.4= 7.1×0.2= 1÷0.1= 3.6÷0.4=0.2×3.1= 4.4﹣1.1= 10+3.4= 1﹣0.87= 6.3×2= 1.25×80=0.2×0.3= 4.8÷1.2= 2.5×0.4= 8×12.5= 7÷3.5= 36÷0.4=
直接写数对又快! 0.25×+2.5%= ; 9.6﹣11÷7+×4= ; 12×[(﹣)×3]= ; 199+1999+19999+199999= ; 1.076×3.4+10.76×0.66= ; 123﹣234+345﹣456+567+678﹣789+890= .
(13×0.58﹣4.87+0.42×13﹣5.13)×4.25.
直接写出得数: 16.15÷1.7+0.85÷1.7= 199+99×99= = = 10.1×99﹣9.9= 3×32+= .
用递等式计算. 1+0.45÷0.9﹣0.75( 5.8﹣3.8÷4 )×0.8.
①7.2×46+108×3.6②③.