12 4.25－3 153125×8.8 0.125×0.25×32 400÷125÷8 25× ÷ × 3210 22253551－(1+2) 17.15－8.47－1.53 17－3－4 0.75+ + +0.375 8457564635144444－(2－1) ＋9 +99 +999 +9999 25×（37×8） 25×32×125 5555546611753531374 31 ×72 ÷31 3 ×(5 －5.375) (＋+)×72 45×( + －0.6) 813848915121824 2351 3.4×99＋3.4 187.7×11－187.7 ( ＋ )×15×11 0.625×0.5+ + ×62.5% 151182 1 152771131÷2＋× 43×＋57.125×－0.5 2.42÷+4.58×1－4÷3 351194982271125311717 22× +25×75%-7×0.75 0.25×63.5－ ×13 6 ×2.5 —2 ×4 ÷+× 44215215 711 ×41419 +5519 ÷147 +711 897×38 －37.5%+104×0.375 0.125×31897994+18×8.25+12.5% ×＋×＋ 2516251616 34x + 12x =2.25 2x - 1.6=5.4 20%x + 34 =4 20 - 15% x = 5 34x ÷ 16 =18 3 - 2x = 35 2 95911 3.5×114 +1.25×2710 +3.8÷45 1×58＋1×411 88＋8 125x + 3x =26 x - 75%x = 52 本文来源：https://www.wddqw.com/doc/13a82c1529160b4e767f5acfa1c7aa00b42a9d01.html