把一个比的后项扩大3倍,前项不变,比值怎么变化?
能简算的用简便方法算.9.28+1.82÷0.7 (71.2﹣71.2×0.9)÷0.25 6.5×2.3+6.5×6.7+6.57.8÷0.25÷4 1.37×99+1.37 4.8×6.2﹣12.4.
怎样算简便就怎样算.(1)4.32+5.43+6.68 (2)15.17﹣6.8﹣3.2 (3)34.82﹣(4.82+15.2)(4)15.27+4.72﹣5.28 (5)4.02﹣3.5+0.98 (6)5.8﹣4.5+5.8﹣4.5.
能简算的要简算.15.6﹣8.9+5.6 7.02+3.8+3.98+2.2 68.4﹣(4.7+8.4)35.8﹣(40﹣44.2) 100﹣13.72﹣36.82 47.35+16.88﹣7.35.
怎样简便就怎样计算0.75×4×0.25×4 9.6+9.6×99 15.58÷8.2﹣0.72 2.8×3.6+1.4×2.8 6.3×10.1.
怎样简便就怎样算.10.8﹣10.8÷3.6×1.5 12.5×2.5×884.7×0.35+0.65×84.7 2.43×99+2.43.