新北师大版四年级下册解方程练习题y+3.5=106y=10y3=4.58+x=9.412-x=8.5x40=1.510.7+n=2132.8-3b=17.84y-24=16100 x6=2.578+10 x=128m33=99x0.9=24.72x5.67=13.6710b=1.4x4.5=8.85y0.3=34.7x+18=50100 x0.4=225x8x=260100 x=4810n=48755x=55x+5.6=910a5.5=10.52b=10010 x=4.22.5=y7.53a5=4.82x10=5.2x0.3=4.65.65x15=6510 x4=225x8x=260m0.7=1.210 x+18=50 x40=4.8y+5y=965x=1.5391x=1005x15=65m0.7=1.24x20=010 x=4.2x3=4.65.618=y7.5x+8.3=10.710 x+5.3=7.3