直接写得数:2.5×0.4= 1.7+5.3= 0.72÷6= 2.8×0.5×0=0.12×5= 6.1﹣6.1= 5÷2.5= 0.99+0.01×10=
怎样简便怎样计算: (1)31.2×91+3.12×90(2)0.25×3.2×12.5(3)2.95×101﹣2.95 (4)89×100.1(5)99÷0.25÷0.4(6)35.6﹣6×1.73.
简便计算 99﹣9.9÷0.25÷0.4; 101×0.59; (+﹣)÷.
285+195+105+415.
用简便方法计算. 45×102 4.93×101﹣4.93 63×( ++) 400÷1.25÷8.
25×32.