四年级下册整数和小数的简便运算练习题 128+1755 15472060-123 100【225 -(7426)】(750-6511)70 【200-(95+60)】80 (231-154)(78-50)10135 3942+3958 689-546-54125+98-125 8299+82 64002541252532 4.65+3.78+5.35 2810282+114+18+586 14490-85144 2532110008125 9932 (320-136)8-1524.7+2.82+3.3+5.18 38101 46.72-22.27-23.73 5.48-2.46+4.52 13.56+(10-2.32) 100.46-(78.46+12.5)7.98-6.45+5.43 22.53-(13.53+7.22) 5.02+6.45+4.98 38101 3299+32 20【262-(120-35)】 (28+32)(1205)